@trwnh any mention of it on docs.joinmastodon.org would be good, I think, but there isn't much about the Mastodon media proxy anywhere on the docs and I feel like that'd be important to mention those specifics (and that causes a lot of issues when other instance software can just attach any kind of file, like a PDF, and Mastodon will be confused, especially with image/video using some codecs and formats, and people won't understand why it breaks and there's nothing documenting it anywhere)