File gone. Can I restore it? – Briefcase Pro - File manager, cloud drive, document & pdf reader and file sharing App Review

Since the last version of this app kept crashing, I had to delete it from my phone and tried to reinstall-install it. Today after I re-installed your app, I found all my original saved files are gone. Is there a way to recover it? Thanks!
Review by Misled by seller on Briefcase Pro - File manager, cloud drive, document & pdf reader and file sharing App.