Photos don't show in Lighroom library on phone

Hi! When I open my Lightroom app on my Android phone, the photos don't show. I can tap the gray squares so it opens a photo. But since I have more than 500 photos in my library, it makes it hard to find the right photo. I CAN export photos, I CAN'T import photos. So annoying! Who knows how I can fix this? 

It seems the photos are still there, I just can't see them in my library.

Kind regards,

Myrthe