OK, so I bit my tongue and bit the bullet today. Updated my 2nd gen WD My Cloud to OS5. So far just one issue. When I access the drive remotely (or through mycloud.com), I can see the “Shared Pictures” folder in the shared “Public” folder, but not “Shared Files” or “Shared Videos” (or anything else in the shared “Public” folder).
When I updated the MyCloud and set up OS5 I was asked to share “pictures” (which I did) but nothing else.