Naming things

Filename in storage (S3, ...)

Always have year, month, day in filename to easily sort it out.

If file is uploaded by user, add user_id in filename, or some other unique identifier depends on your business in which you require to upload.

Personally, I always add timestamp and extra data in filename to avoid duplicate.

Example filename: yyyy/mm/dd/{user_id}-{timestamp}-{extra}.ext

Be careful with /, too much nested folder is no good for backup (as they say, idk if true or not, but less folder mean less complicated to me).