like, idk how it is on app, but on the web version of here you can click your profile and there should be a drop down to see all the media youve uploaded. including duplicate pictures that might have been used more than once.
just deleting a post/comment, or editing it to take the photo out doesnt actually delete it. you have to go to that media tab on your profile and individually delete every picture.
I thought about there being a bot that checks any file older than like a month to see if its linked to any post and then if not deletes it from the servers, idk how hard it would be to implement but i feel like lemmy should just do that inherently tbh
Especially with how embeded images work here, you can very easily search for every single instance of an image being used