Hello,
Is there any reason why this isnt possible (using latest 9.9.16 Server ) ?
I think there's legitimate use case for this to work. For example recorded Live TV where episode information is not up to date on theTVDB ( or not there at all) but poster and background is available.
Use case: Match Of the Day is weekly show which I record and export to Plex each weekend. Obviously recording does not have poster/genre or show information but exported file DOES have episode info which is picked up by Personal Media Agent etc.
If theTVDB could be assigned as secondary agent for Personal Media Shows, missing metadata would be most of the time filled in.