My server doesnt transcode as far as i know. Its a synology nas, but that shouldnt be a problem since it is possible for the admin.
Also the server is only reachable from inside the network.
It doesnt matter if i enable or disable it for the users, its stil only possible for the admin.
I’ve been checking some other support articles. From what I can find you might have run into one of the restrictions of mobile sync by syncing/downloading with your own (admin) account.
According to the support article on the mobile sync feature, the client can only sync media for 1 account per device (assuming a phone is mostly used by a single user).
Note : … . Only one user can have synced content at any given time on a particular device.