Correct latest version of the av file or of the kind zero?
Iād actually prefer if you couldnāt swap the file once itās been published
Think about it like this - your kind zero lists a primary blossom server. Notes reference the file hash. Basic Clients take the file hash from the note and pull it from the blossom server mentioned in the kind zero. More advanced clients can search a lot of blossom clients to find that hash.
Thereās no reason the kind zero canāt mention multiple blossom servers in fact (mirrors)
Because the hash is used, no user will be served an incorrect file. Because the kind zero can be updated, broken links can be fixed without breaking the original published note
This even allows for authorship metadata in the original file to point to the npub for making sure the right publisher is Zappable no matter how you got your hands on the file