Can't view Pictures on My Cloud Mobile App after upgrade to OS5

My Cloud OS 5 Personal & Network Attached Storage My Cloud EX Series
1

I upgraded MY CLOUD EX2 ULTRA to version 5.
When I connect to it through the My Cloud Mobile App (version 5.08.115) in the “Pictures” section the pictures are displayed in a grid, sorted by dates, but when selecting a specific picture it is not displayed (but a black screen).