So, renders and animations of existed GLTF models are not updated when uploading via pcsync. ‘Re-import’ context-menu item has no effect too. But they are normally updated when drag’n’drop. All model import options are on.
Pcsync says that the file has been updated.
Not sure what the problem could be, but I’m not 100% sure pcsync was much tested for assets other than scripts.