After the migration to Yunohost 12 and Synapse 1.121, do you know if Sliding Sync is operational on our Synapse server?
I may have understood it is now included in latest Synapse versions (no need to add additional proxy), but I can connect to my server with Element X (client using this Sliding Sync function).
But I am not sure to fully catch the consequences on our server (I read clients are faster and calls even more reliable).