I have had more cases where I was very surprised that the local filename I used for something became part of its record when I uploaded it somewhere. (For instance, uploading an Mp3 using Discord on desktop web.)

There are many, many more cases where the user doesn’t expect the name to become public when he sends a photo. If I send you a photo of a friend that doesn’t mean I want you to know his name (which is the name I gave the file when I saved it)