Hello All. I've used Calibre for years to maintain a modest library to support what I had on my Nook, but I recently got a boox tablet and having a full suite of android apps available has made me tackle my Calibre library with more vigor.
I have quite a few custom attributes set up - the most important to me being a "Universe" attribute (For when an author writes multiple series set in the same universe, or for when multiple authors are contributing to the same universe). I often filter my Calibre Library by Universe > Series, not by author.
However I have yet to find a reader, or maybe I've failed to properly configure one, that lets me use this metadata on the reader. Half of them do