Users of a Seafile server should be able to share files or folders with users of other servers much like the owncloud/nextcloud federation:
By now I have many Seafile servers around me and it just doesn’t make sense to have dozens of accounts just to collaborate with people in other companies. Another grievance regarding this, is the distinction between upload- and download-links (see here).
I’d like to bump this request a little. It’s been some time but the need is still there as the number of Seafile installs grows, more and more people would love to use only one account.
Using the new ActivityPub standard would probably be the best way to go (which others doing federation are already doing).