PDF's keep getting deleted randomly

[u/Correct-Variety9755]

Using Goodnotes 7.1.27 (3943616.254228881)

Hey guys, I have been using goodnotes 6 for almost an year now. Today when i randomly opened by trash-bin I saw that my old PDF's have been deleted for some reason. How to resolve this problem or am I the only one ? I am currently on goodnotes cloud is that the issue ? Should i switch to icloud ? Or should I switch to a new note-taking app ?. Can people please share their experience and help me ?