I have a Nook HD+ with the Photoshop express app and it does not see the images on my sd card or gallery and I do not know how to upload images to it from the cloud or my computer? I apologize in adnce if I am sending this to the wrong place, but Adobe does not exactly make these forums user friendly!
Can you please see if the below solution fixes the issue mentioned by you.
1. On the Home screen of the app, tap on Menu
2. Select More -> Settings
3. Uncheck the option of "Show photos only in Phone View"
Thanks for reporting the issue.
Hoping this helps