Wallpaper not cycling through photos randomly

I am trying to have Wallpaper (through System Settings) rotate through pictures in my photos album as my desktop background.

I have selected and added an album from the Wallpaper setting of system settings via "Add Photo Album" from the pulldown menu at the bottom.

It will display 1 picture on the desktop but when I click on Random (to cycle pictures) it reverts to the generic Mac background.

I have tried running through 'All Pictures', different Albums, individual (smaller albums), and nothing seems to work.

I have it selected to rotate every day but even changing it to all of the different options (5 seconds, when waking from sleep, etc) it doesn't work.

In addition, if I have it rotate through pictures not randomly (without checking the box) it only cycles through 2 pictures.

The photos file is located on an External drive with 3.5 TB available. It is loaded as the default photos album in Photos and doesn't show any delay when observing photos from the app.

The Photos file is too large to put on the main HD which is why it goes through the external HD.

I have run disk first aid on both volumes, checked the "Profiles" (there are none), tried restarting, and probably a few other things.

Mac Studio, Ventura 13.5.1, Apple M2 Ultra, 128GB Memory, 1TB HD space (with 511 GB available)

Apple Studio Display and a single monitor, connected via the thunderbolt cord (that was supplied with the monitor).

Thanks for your help,

Mark