This has been discussed 2145676 times... besides asking the question in the wrong topic.
It is not problem with resolution. It is problem with system. Primo does not work on android 8.

Use any Nextgen according to your needs
Browse Forum. Read. Learn
[Only registered and activated users can see links. ]

It would be nice if you first present yourself here: [Only registered and activated users can see links. ].
Then read: [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]