I am really a big fan of Seafile since the first day I installed v2 in 2013. Since then I have deployed it from embedded PCs to bigger servers, CE as well as Pro Edition.
I am also totally fine with the feature split between CE and Pro (Private Server - Seafile), because CE offers most of the usefull functions to the users and contains all what you need for a usual single server setup. But for this feature I can really not understand what the (only) Pro part is here. Having a single link for uploading and downloading is especially usefull in private collecting and sharing files (e.g. photos). In business applications it is for me more questionable if this shall be allowed at all because of security concerns (there were already some dicussion concerning this point here in the forum).
But maybe it was also simply added to the permissions function for coding convinience because there were already other options and not because it is seen as pure Pro feature. And even if maybe the Seafile team can rethink their decision and make it available to everyone. @daniel.pan