Hi Nathan! Trying to see if this feature available at all. Similar to Plex for example where it remembers the last position on any given video from any device on the network. Saves a lot time to fast forward the same movie from different TVs.
But, if you’re using streaming add-ons, the only way I’ve got that to work is by using a Trakt account, signing into your Trakt account with the add-ons you use, and ALSO install the official Trakt add-on from the official Kodi Repo and configure that to sync watched status and progress.