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When creating or updating a chat message, uploads attached to the message are filtered so as to only keep uploads created by the message creator using `Upload.user`. This field, however, only points to the _original_ user that created the upload, but since uploads are de-duplicated, other users might have also uploaded the file. This PR fixes this by looking at the `UserUpload`s instead (as suggested by @SamSaffron). Reported here: https://meta.discourse.org/t/chat-upload-bug/379253