This has been an interesting process, adding multiplayer to something that never intended to be multiplayer. Luckily with the engine supporting it out of the box it was really just ticking some boxes here and there and adding multiplayer specific things like the nameplates for who is editing something and the player avatar for other clients to see.
If there are any issues please let me know! Feedback and suggestions are more than welcome. Thanks for playing Thumbnail Studio!
[Sync] does almost everything. Display names, player colors, the active preset on a character, the backdrop index, anim params, morphs, they're all just properties marked [Sync]. The game fires a [Change] handler on the other side, you reapply it locally. Owner-write by default, or [Sync(SyncFlags.FromHost)] for stuff only the host should decide (like which map is loaded).
Every networked object has one owner at a time, and whoever owns it is the one whose Sync writes win. Click a character and you call Network.TakeOwnership() on it. From then on your client is writing its pose, outfit, camera angle, and everyone else just reads from these sync properties because the editor is the owner.
