Just looked into this and it looks like @pixelfed doesn't support remote edits of the media after posting, which seems like a big issue. If I post the wrong photo and edit it here on Mastodon I would expect that edit to be propagated to anyone following me, but of course I know that is not the case with some software cause not everyone has written support for edits, but still this is something someone needs to be working on...
pixelfed.dk/p/Katharsisdrill/8

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