Import

You can import a single folder or let JRiver watch folders for automatic import.

Single folder

Here you can set if files previously removed from the library should be ignored.

Configure auto import

Analyze audio will determine Replay Gain/Album Gain, Peak Level, BPM, and Intensity.

Build thumbnails speeds up JRiver when displaying covers

Auto import

Scans all the files in the monitored folders.

You get a summary

Obvious exactly the things you would like to know, the files previously deleted and the bad ones are not in this summary. One of those small shortcomings in the JRiver interface.

The only way to find out the "bad" files is to make a smartlist.