Lightroom mobile photos gone

[ஜாஸ்ம26958724]

1. Hi,  I need a help my all photos was gone from a while and that what happened,  I wish someone can help me. 
   The problem started when there wasn't space to save any new picture so I change the storage location when I did that all the pictures didn't appear and appeared black, so I tried to return it to the first storage location, but it became like when I started using it, it back to the free version 
   I started using LR app mobile since almost September 2019
   The version I'm using is v5.2.2