I have a MP3 version of John Coltranes My Favorite Things on my drive and searched for this version in Roon. The search result contained anything else a John Coltrane, but after filter I found al low number of the song. When I search for the song in Qobuz, there are many more results and I found the version there.
The album “A Serious Thing” was not listed in the Roon discographie, but synced after making it to a favorite in Qobuz. It’s a workaround, but complicated.
The Roon search is really not what expected …