Not sure if they're is a self or security feature I missed, but sync can only see the favorite, camera, screenshot, and download albums on my phone. I can find photos from other albums by using the photos tab but it is harder to find them as it is all pictures on my phone.
Device information
Sync version: v23.08.12-23:05
Sync flavor: googlePlay
Ultra user: true
View type: Slides
Device: t2q
Model: samsung SM-G996U
Android: 13
I could be completely wrong since I haven't tested it myself, but I believe when I first heard this feature announced, it was mentioned that this dialog is rendered by the system / GSF so it's possible that it's not actually something that can be changed, outside of the overflow menu unfortunately.
Didn't even occur to me it could be an actual limitation. Thanks for clarifying.