Hello @Bob_Johnson and welcome to the forum.
Fellow Roon user here, trying to help.
What is a forced Rescan? That is when Roon actively goes and searches the files and folders of your library for changes.
What does “watching in real-time” mean? It means that Roon requested to be notified about changes in your library and the request got granted by the OS of the device that holds your library. If the requested notifications don’t get sent or don’t reach Roon, there is nothing Roon can do about it. As remote connections are notorious for failing to send notifications, Roon has implement a timed rescan for remote libraries (see your screenshot “Automatic rescan interval”).
So you have three options:
- Issue a manual rescan after you changed your library
- Wait for the automatic rescan to catch changes
- Try to find out what blocks the notifications and fix it
Note: Synology changed a lot of internals with the release of DSM 7 - included is a change that resets the max_user_watches to 8192. So if your NAS runs DSM 7 there is a good chance that your library is bigger than that watch limit. Even if you’re still on DSM 6 that option has a limited value, I just don’t know how much it is, and your library may have out grown it. Please check and take appropriate actions. You can use the information from the posting below to change the value for max_user_watches should this be needed: