thanks for the continuing reply Hadron, I got diskUsage, its interesting and shows a shocking 16.4gb of "system data" which would seem to be my mystery space usage, and not quite sure if I'm seeing the actual files in there on the right side brown colored lists of files.
its a bit confusing how to use this and haven't found any tutorials or how to use posts that explain much of anything
it seems once you select a category like "system data" it shows that it is selected by a white outline around the box but I'm not sure at this point if after selecting it, all the files that are in "system data" show up in the tan color section on the right, that is how it seems to work for other categories.
once I select "system data" there are 2 brown colored lists, top and bottom. there's a bunch of .apks and lots of files with no extension and no recognizable name but seem to be time stamps down to a millisecond like 2019_11_20_14_20_20_065 (yy-mm-dd,hh,mm.ss,ms) there are easily 000's of these
this lists are sorted (don't see any place to change the sort order) by file size, they range in size from about 100mb down to about 1mb, I'd say the majority range in size from 10mb to 1mb, some what hard to tell but maybe they could all add up to 14gb
I know I can delete the .apk files, but not sure about the files that have the time stamp for a file name.
don't see any way to do multiple deletes if those time stamp name files can in fact be deleted, it would be not be practical to delete them one by one