What is the need for synced playlists

On iPad whenever I try to create playlist from content on remote Plex server, that playlist goes to tab on the left, while in right tab for synced playlist there is nothing. Is it only for content from GDrive or something?

The Synced term in Infuse refers to items stored locally on your device.

You can have a playlist made from remote items or synced items, but you cannot have a list of both remote and synced.