Hi ! I've seen that when a Mastodon toot with an attachment arrives at a GNUsocial server the attachment is not included as a link like with the ones coming from other GNUsocial servers or Pleroma instances. There is nothing for a GNUsocial user to know that there is an attachment there and I think that this should be fixed, even if maybe it's not our fault.

Also, it's that with the plugin StoreRemoteMedia the attachments are downloaded to the local server and shown to the user, but that plugin shouldn't be obligatory to get the attachments' link federated