Library versions: Multiple version of the same album (e.g., regular and "Legacy Version") with different numbers of tracks

[Rugby (aka Daniel or Big Dan)]

Roon Album grouping, what does it do?

Versions means different versions of the same album, like Allman Brothers Live at the Fillmore, and Live at the Fillmore Complete Concert. Groups are for when Roon detects (or you manually group) two copies of the same album together, like Born to Run in DSD and Born to Run in 24/192 [exact same album just different formats]. Its late and I hope I explained it well.