In the distant past I recall a discussion regarding how an album set gets its thumbnail images. I recall looking at this previously, CE2?, and never really managed to get it to work. I eventually just manually populated the /thumbnail directories with a few thumbnail images. Now I am experimenting with the Journal album set type and have found that thumbnail size again matters. I have updated my site with larger thumbnails and have again come across this issue.
For Example:
US travel has 4 subordinate album sets. One has empty /thumbnail directories and the other 3 have old low resolution thumbnails manually copied into the respective /thumbnail directories.
Central Time also cannot find a thumbnail and not sure why.
Central time favorites is the deepest album set and it too has trouble finding a thumbnail to display.
Looked in the documentation, a bit difficult to search, and in this forum but couldn’t find a discussion. If I could find the rules I’m sure I could get it to work. Thoughts?