diff --git a/app/javascript/flavours/glitch/actions/compose.js b/app/javascript/flavours/glitch/actions/compose.js
index f837380936..eebe986263 100644
--- a/app/javascript/flavours/glitch/actions/compose.js
+++ b/app/javascript/flavours/glitch/actions/compose.js
@@ -10,6 +10,7 @@ import { importFetchedAccounts } from './importer';
 import { updateTimeline } from './timelines';
 import { showAlertForError } from './alerts';
 import { showAlert } from './alerts';
+import { openModal } from './modal';
 import { defineMessages } from 'react-intl';
 
 let cancelFetchComposeSuggestionsAccounts, cancelFetchComposeSuggestionsTags;
@@ -68,6 +69,11 @@ export const COMPOSE_POLL_OPTION_CHANGE   = 'COMPOSE_POLL_OPTION_CHANGE';
 export const COMPOSE_POLL_OPTION_REMOVE   = 'COMPOSE_POLL_OPTION_REMOVE';
 export const COMPOSE_POLL_SETTINGS_CHANGE = 'COMPOSE_POLL_SETTINGS_CHANGE';
 
+export const INIT_MEDIA_EDIT_MODAL = 'INIT_MEDIA_EDIT_MODAL';
+
+export const COMPOSE_CHANGE_MEDIA_DESCRIPTION = 'COMPOSE_CHANGE_MEDIA_DESCRIPTION';
+export const COMPOSE_CHANGE_MEDIA_FOCUS       = 'COMPOSE_CHANGE_MEDIA_FOCUS';
+
 const messages = defineMessages({
   uploadErrorLimit: { id: 'upload_error.limit', defaultMessage: 'File upload limit exceeded.' },
   uploadErrorPoll:  { id: 'upload_error.poll', defaultMessage: 'File upload not allowed with polls.' },
@@ -339,6 +345,32 @@ export const uploadThumbnailFail = error => ({
   skipLoading: true,
 });
 
+export function initMediaEditModal(id) {
+  return dispatch => {
+    dispatch({
+      type: INIT_MEDIA_EDIT_MODAL,
+      id,
+    });
+
+    dispatch(openModal('FOCAL_POINT', { id }));
+  };
+};
+
+export function onChangeMediaDescription(description) {
+  return {
+    type: COMPOSE_CHANGE_MEDIA_DESCRIPTION,
+    description,
+  };
+};
+
+export function onChangeMediaFocus(focusX, focusY) {
+  return {
+    type: COMPOSE_CHANGE_MEDIA_FOCUS,
+    focusX,
+    focusY,
+  };
+};
+
 export function changeUploadCompose(id, params) {
   return (dispatch, getState) => {
     dispatch(changeUploadComposeRequest());
diff --git a/app/javascript/flavours/glitch/features/compose/containers/upload_container.js b/app/javascript/flavours/glitch/features/compose/containers/upload_container.js
index f687fae99d..f3ca4ce7bb 100644
--- a/app/javascript/flavours/glitch/features/compose/containers/upload_container.js
+++ b/app/javascript/flavours/glitch/features/compose/containers/upload_container.js
@@ -1,7 +1,6 @@
 import { connect } from 'react-redux';
 import Upload from '../components/upload';
-import { undoUploadCompose } from 'flavours/glitch/actions/compose';
-import { openModal } from 'flavours/glitch/actions/modal';
+import { undoUploadCompose, initMediaEditModal } from 'flavours/glitch/actions/compose';
 import { submitCompose } from 'flavours/glitch/actions/compose';
 
 const mapStateToProps = (state, { id }) => ({
@@ -15,7 +14,7 @@ const mapDispatchToProps = dispatch => ({
   },
 
   onOpenFocalPoint: id => {
-    dispatch(openModal('FOCAL_POINT', { id }));
+    dispatch(initMediaEditModal(id));
   },
 
   onSubmit (router) {
diff --git a/app/javascript/flavours/glitch/features/ui/components/focal_point_modal.js b/app/javascript/flavours/glitch/features/ui/components/focal_point_modal.js
index b7ec63333c..5a4baa5a14 100644
--- a/app/javascript/flavours/glitch/features/ui/components/focal_point_modal.js
+++ b/app/javascript/flavours/glitch/features/ui/components/focal_point_modal.js
@@ -4,7 +4,7 @@ import PropTypes from 'prop-types';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { connect } from 'react-redux';
 import classNames from 'classnames';
-import { changeUploadCompose, uploadThumbnail } from 'flavours/glitch/actions/compose';
+import { changeUploadCompose, uploadThumbnail, onChangeMediaDescription, onChangeMediaFocus } from 'flavours/glitch/actions/compose';
 import { getPointerPosition } from 'flavours/glitch/features/video';
 import { FormattedMessage, defineMessages, injectIntl } from 'react-intl';
 import IconButton from 'flavours/glitch/components/icon_button';
@@ -27,14 +27,22 @@ import { assetHost } from 'flavours/glitch/util/config';
 const messages = defineMessages({
   close: { id: 'lightbox.close', defaultMessage: 'Close' },
   apply: { id: 'upload_modal.apply', defaultMessage: 'Apply' },
+  applying: { id: 'upload_modal.applying', defaultMessage: 'Applying…' },
   placeholder: { id: 'upload_modal.description_placeholder', defaultMessage: 'A quick brown fox jumps over the lazy dog' },
   chooseImage: { id: 'upload_modal.choose_image', defaultMessage: 'Choose image' },
+  discardMessage: { id: 'confirmations.discard_edit_media.message', defaultMessage: 'You have unsaved changes to the media description or preview, discard them anyway?' },
+  discardConfirm: { id: 'confirmations.discard_edit_media.confirm', defaultMessage: 'Discard' },
 });
 
 const mapStateToProps = (state, { id }) => ({
   media: state.getIn(['compose', 'media_attachments']).find(item => item.get('id') === id),
   account: state.getIn(['accounts', me]),
   isUploadingThumbnail: state.getIn(['compose', 'isUploadingThumbnail']),
+  description: state.getIn(['compose', 'media_modal', 'description']),
+  focusX: state.getIn(['compose', 'media_modal', 'focusX']),
+  focusY: state.getIn(['compose', 'media_modal', 'focusY']),
+  dirty: state.getIn(['compose', 'media_modal', 'dirty']),
+  is_changing_upload: state.getIn(['compose', 'is_changing_upload']),
 });
 
 const mapDispatchToProps = (dispatch, { id }) => ({
@@ -43,6 +51,14 @@ const mapDispatchToProps = (dispatch, { id }) => ({
     dispatch(changeUploadCompose(id, { description, focus: `${x.toFixed(2)},${y.toFixed(2)}` }));
   },
 
+  onChangeDescription: (description) => {
+    dispatch(onChangeMediaDescription(description));
+  },
+
+  onChangeFocus: (focusX, focusY) => {
+    dispatch(onChangeMediaFocus(focusX, focusY));
+  },
+
   onSelectThumbnail: files => {
     dispatch(uploadThumbnail(id, files[0]));
   },
@@ -83,8 +99,8 @@ class ImageLoader extends React.PureComponent {
 
 }
 
-export default @connect(mapStateToProps, mapDispatchToProps)
-@injectIntl
+export default @connect(mapStateToProps, mapDispatchToProps, null, { forwardRef: true })
+@(component => injectIntl(component, { withRef: true }))
 class FocalPointModal extends ImmutablePureComponent {
 
   static propTypes = {
@@ -92,34 +108,21 @@ class FocalPointModal extends ImmutablePureComponent {
     account: ImmutablePropTypes.map.isRequired,
     isUploadingThumbnail: PropTypes.bool,
     onSave: PropTypes.func.isRequired,
+    onChangeDescription: PropTypes.func.isRequired,
+    onChangeFocus: PropTypes.func.isRequired,
     onSelectThumbnail: PropTypes.func.isRequired,
     onClose: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
   };
 
   state = {
-    x: 0,
-    y: 0,
-    focusX: 0,
-    focusY: 0,
     dragging: false,
-    description: '',
     dirty: false,
     progress: 0,
     loading: true,
     ocrStatus: '',
   };
 
-  componentWillMount () {
-    this.updatePositionFromMedia(this.props.media);
-  }
-
-  componentWillReceiveProps (nextProps) {
-    if (this.props.media.get('id') !== nextProps.media.get('id')) {
-      this.updatePositionFromMedia(nextProps.media);
-    }
-  }
-
   componentWillUnmount () {
     document.removeEventListener('mousemove', this.handleMouseMove);
     document.removeEventListener('mouseup', this.handleMouseUp);
@@ -164,54 +167,37 @@ class FocalPointModal extends ImmutablePureComponent {
     const focusX   = (x - .5) *  2;
     const focusY   = (y - .5) * -2;
 
-    this.setState({ x, y, focusX, focusY, dirty: true });
-  }
-
-  updatePositionFromMedia = media => {
-    const focusX      = media.getIn(['meta', 'focus', 'x']);
-    const focusY      = media.getIn(['meta', 'focus', 'y']);
-    const description = media.get('description') || '';
-
-    if (focusX && focusY) {
-      const x = (focusX /  2) + .5;
-      const y = (focusY / -2) + .5;
-
-      this.setState({
-        x,
-        y,
-        focusX,
-        focusY,
-        description,
-        dirty: false,
-      });
-    } else {
-      this.setState({
-        x: 0.5,
-        y: 0.5,
-        focusX: 0,
-        focusY: 0,
-        description,
-        dirty: false,
-      });
-    }
+    this.props.onChangeFocus(focusX, focusY);
   }
 
   handleChange = e => {
-    this.setState({ description: e.target.value, dirty: true });
+    this.props.onChangeDescription(e.target.value);
   }
 
   handleKeyDown = (e) => {
     if (e.keyCode === 13 && (e.ctrlKey || e.metaKey)) {
       e.preventDefault();
       e.stopPropagation();
-      this.setState({ description: e.target.value, dirty: true });
+      this.props.onChangeDescription(e.target.value);
       this.handleSubmit();
     }
   }
 
   handleSubmit = () => {
-    this.props.onSave(this.state.description, this.state.focusX, this.state.focusY);
-    this.props.onClose();
+    this.props.onSave(this.props.description, this.props.focusX, this.props.focusY);
+  }
+
+  getCloseConfirmationMessage = () => {
+    const { intl, dirty } = this.props;
+
+    if (dirty) {
+      return {
+        message: intl.formatMessage(messages.discardMessage),
+        confirm: intl.formatMessage(messages.discardConfirm),
+      };
+    } else {
+      return null;
+    }
   }
 
   setRef = c => {
@@ -257,7 +243,8 @@ class FocalPointModal extends ImmutablePureComponent {
         await worker.loadLanguage('eng');
         await worker.initialize('eng');
         const { data: { text } } = await worker.recognize(media_url);
-        this.setState({ description: removeExtraLineBreaks(text), dirty: true, detecting: false });
+        this.setState({ detecting: false });
+        this.props.onChangeDescription(removeExtraLineBreaks(text));
         await worker.terminate();
       })().catch((e) => {
         if (refreshCache) {
@@ -274,7 +261,6 @@ class FocalPointModal extends ImmutablePureComponent {
 
   handleThumbnailChange = e => {
     if (e.target.files.length > 0) {
-      this.setState({ dirty: true });
       this.props.onSelectThumbnail(e.target.files);
     }
   }
@@ -288,8 +274,10 @@ class FocalPointModal extends ImmutablePureComponent {
   }
 
   render () {
-    const { media, intl, account, onClose, isUploadingThumbnail } = this.props;
-    const { x, y, dragging, description, dirty, detecting, progress, ocrStatus } = this.state;
+    const { media, intl, account, onClose, isUploadingThumbnail, description, focusX, focusY, dirty, is_changing_upload } = this.props;
+    const { dragging, detecting, progress, ocrStatus } = this.state;
+    const x = (focusX /  2) + .5;
+    const y = (focusY / -2) + .5;
 
     const width  = media.getIn(['meta', 'original', 'width']) || null;
     const height = media.getIn(['meta', 'original', 'height']) || null;
@@ -344,7 +332,7 @@ class FocalPointModal extends ImmutablePureComponent {
                     accept='image/png,image/jpeg'
                     onChange={this.handleThumbnailChange}
                     style={{ display: 'none' }}
-                    disabled={isUploadingThumbnail}
+                    disabled={isUploadingThumbnail || is_changing_upload}
                   />
                 </label>
 
@@ -363,7 +351,7 @@ class FocalPointModal extends ImmutablePureComponent {
                 value={detecting ? '…' : description}
                 onChange={this.handleChange}
                 onKeyDown={this.handleKeyDown}
-                disabled={detecting}
+                disabled={detecting || is_changing_upload}
                 autoFocus
               />
 
@@ -373,11 +361,11 @@ class FocalPointModal extends ImmutablePureComponent {
             </div>
 
             <div className='setting-text__toolbar'>
-              <button disabled={detecting || media.get('type') !== 'image'} className='link-button' onClick={this.handleTextDetection}><FormattedMessage id='upload_modal.detect_text' defaultMessage='Detect text from picture' /></button>
+              <button disabled={detecting || media.get('type') !== 'image' || is_changing_upload} className='link-button' onClick={this.handleTextDetection}><FormattedMessage id='upload_modal.detect_text' defaultMessage='Detect text from picture' /></button>
               <CharacterCounter max={1500} text={detecting ? '' : description} />
             </div>
 
-            <Button disabled={!dirty || detecting || isUploadingThumbnail || length(description) > 1500} text={intl.formatMessage(messages.apply)} onClick={this.handleSubmit} />
+            <Button disabled={!dirty || detecting || isUploadingThumbnail || length(description) > 1500 || is_changing_upload} text={intl.formatMessage(is_changing_upload ? messages.applying : messages.apply)} onClick={this.handleSubmit} />
           </div>
 
           <div className='focal-point-modal__content'>
diff --git a/app/javascript/flavours/glitch/features/ui/components/modal_root.js b/app/javascript/flavours/glitch/features/ui/components/modal_root.js
index 2636e79f53..62bb167a05 100644
--- a/app/javascript/flavours/glitch/features/ui/components/modal_root.js
+++ b/app/javascript/flavours/glitch/features/ui/components/modal_root.js
@@ -83,16 +83,33 @@ export default class ModalRoot extends React.PureComponent {
     return <BundleModalError {...props} onClose={onClose} />;
   }
 
+  handleClose = () => {
+    const { onClose } = this.props;
+    let message = null;
+    try {
+      message = this._modal?.getWrappedInstance?.().getCloseConfirmationMessage?.();
+    } catch (_) {
+      // injectIntl defines `getWrappedInstance` but errors out if `withRef`
+      // isn't set.
+      // This would be much smoother with react-intl 3+ and `forwardRef`.
+    }
+    onClose(message);
+  }
+
+  setModalRef = (c) => {
+    this._modal = c;
+  }
+
   render () {
-    const { type, props, onClose } = this.props;
+    const { type, props } = this.props;
     const { backgroundColor } = this.state;
     const visible = !!type;
 
     return (
-      <Base backgroundColor={backgroundColor} onClose={onClose} noEsc={props ? props.noEsc : false}>
+      <Base backgroundColor={backgroundColor} onClose={this.handleClose} noEsc={props ? props.noEsc : false}>
         {visible && (
           <BundleContainer fetchComponent={MODAL_COMPONENTS[type]} loading={this.renderLoading(type)} error={this.renderError} renderDelay={200}>
-            {(SpecificComponent) => <SpecificComponent {...props} onChangeBackgroundColor={this.setBackgroundColor} onClose={onClose} />}
+            {(SpecificComponent) => <SpecificComponent {...props} onChangeBackgroundColor={this.setBackgroundColor} onClose={this.handleClose} ref={this.setModalRef} />}
           </BundleContainer>
         )}
       </Base>
diff --git a/app/javascript/flavours/glitch/features/ui/containers/modal_container.js b/app/javascript/flavours/glitch/features/ui/containers/modal_container.js
index e13e745e6d..039aabd8ae 100644
--- a/app/javascript/flavours/glitch/features/ui/containers/modal_container.js
+++ b/app/javascript/flavours/glitch/features/ui/containers/modal_container.js
@@ -1,5 +1,5 @@
 import { connect } from 'react-redux';
-import { closeModal } from 'flavours/glitch/actions/modal';
+import { openModal, closeModal } from 'flavours/glitch/actions/modal';
 import ModalRoot from '../components/modal_root';
 
 const mapStateToProps = state => ({
@@ -8,8 +8,18 @@ const mapStateToProps = state => ({
 });
 
 const mapDispatchToProps = dispatch => ({
-  onClose () {
-    dispatch(closeModal());
+  onClose (confirmationMessage) {
+    if (confirmationMessage) {
+      dispatch(
+        openModal('CONFIRM', {
+          message: confirmationMessage.message,
+          confirm: confirmationMessage.confirm,
+          onConfirm: () => dispatch(closeModal()),
+        }),
+      );
+    } else {
+      dispatch(closeModal());
+    }
   },
 });
 
diff --git a/app/javascript/flavours/glitch/reducers/compose.js b/app/javascript/flavours/glitch/reducers/compose.js
index e989401d87..1735cfb4d6 100644
--- a/app/javascript/flavours/glitch/reducers/compose.js
+++ b/app/javascript/flavours/glitch/reducers/compose.js
@@ -42,6 +42,9 @@ import {
   COMPOSE_POLL_OPTION_CHANGE,
   COMPOSE_POLL_OPTION_REMOVE,
   COMPOSE_POLL_SETTINGS_CHANGE,
+  INIT_MEDIA_EDIT_MODAL,
+  COMPOSE_CHANGE_MEDIA_DESCRIPTION,
+  COMPOSE_CHANGE_MEDIA_FOCUS,
 } from 'flavours/glitch/actions/compose';
 import { TIMELINE_DELETE } from 'flavours/glitch/actions/timelines';
 import { STORE_HYDRATE } from 'flavours/glitch/actions/store';
@@ -97,6 +100,13 @@ const initialState = ImmutableMap({
   resetFileKey: Math.floor((Math.random() * 0x10000)),
   idempotencyKey: null,
   tagHistory: ImmutableList(),
+  media_modal: ImmutableMap({
+    id: null,
+    description: '',
+    focusX: 0,
+    focusY: 0,
+    dirty: false,
+  }),
   doodle: ImmutableMap({
     fg: 'rgb(  0,    0,    0)',
     bg: 'rgb(255,  255,  255)',
@@ -455,6 +465,19 @@ export default function compose(state = initialState, action) {
 
         return item;
       }));
+  case INIT_MEDIA_EDIT_MODAL:
+    const media =  state.get('media_attachments').find(item => item.get('id') === action.id);
+    return state.set('media_modal', ImmutableMap({
+      id: action.id,
+      description: media.get('description') || '',
+      focusX: media.getIn(['meta', 'focus', 'x'], 0),
+      focusY: media.getIn(['meta', 'focus', 'y'], 0),
+      dirty: false,
+    }));
+  case COMPOSE_CHANGE_MEDIA_DESCRIPTION:
+    return state.setIn(['media_modal', 'description'], action.description).setIn(['media_modal', 'dirty'], true);
+  case COMPOSE_CHANGE_MEDIA_FOCUS:
+    return state.setIn(['media_modal', 'focusX'], action.focusX).setIn(['media_modal', 'focusY'], action.focusY).setIn(['media_modal', 'dirty'], true);
   case COMPOSE_MENTION:
     return state.withMutations(map => {
       map.update('text', text => [text.trim(), `@${action.account.get('acct')} `].filter((str) => str.length !== 0).join(' '));
@@ -491,6 +514,7 @@ export default function compose(state = initialState, action) {
   case COMPOSE_UPLOAD_CHANGE_SUCCESS:
     return state
       .set('is_changing_upload', false)
+      .setIn(['media_modal', 'dirty'], false)
       .update('media_attachments', list => list.map(item => {
         if (item.get('id') === action.media.id) {
           return fromJS(action.media);
diff --git a/app/javascript/flavours/glitch/reducers/modal.js b/app/javascript/flavours/glitch/reducers/modal.js
index f8fdc29954..ae205c6d54 100644
--- a/app/javascript/flavours/glitch/reducers/modal.js
+++ b/app/javascript/flavours/glitch/reducers/modal.js
@@ -1,5 +1,6 @@
 import { MODAL_OPEN, MODAL_CLOSE } from 'flavours/glitch/actions/modal';
 import { TIMELINE_DELETE } from 'flavours/glitch/actions/timelines';
+import { COMPOSE_UPLOAD_CHANGE_SUCCESS } from 'flavours/glitch/actions/compose';
 import { Stack as ImmutableStack, Map as ImmutableMap } from 'immutable';
 
 export default function modal(state = ImmutableStack(), action) {
@@ -8,6 +9,8 @@ export default function modal(state = ImmutableStack(), action) {
     return state.unshift(ImmutableMap({ modalType: action.modalType, modalProps: action.modalProps }));
   case MODAL_CLOSE:
     return (action.modalType === undefined || action.modalType === state.getIn([0, 'modalType'])) ? state.shift() : state;
+  case COMPOSE_UPLOAD_CHANGE_SUCCESS:
+    return state.getIn([0, 'modalType']) === 'FOCAL_POINT' ? state.shift() : state;
   case TIMELINE_DELETE:
     return state.filterNot((modal) => modal.get('modalProps').statusId === action.id);
   default: