Collections Based on Metadata Matching

[TheDreadPirate]

Re-scanning Collections from the XML metadata no longer functions outside of the initial library set-up. It was removed (for some functional? reson) with 9.3 or 4 I believe. I used to use it all the time. Now it's basically broken.

I'm not sure when the last time you've tried was, but in 10.10.6 the process I described worked for restoring a collection from the XML.  Just straight up move the folder for the collection back into the over arching collections folder, scanned, and it was restored.