Issue with Icloud sync


Can someone tell me where are the backup files synced with Icloud in Marginnote ?

1-In the app I click on the 3 black points on the left down and click on “Cloud Sync”

2-I have another Ipad with Marginnote.
I open it and goes to Cloud Sync : a window opens and I select a file by clicking on the 3 points on the right and select “download from Icloud” but I can’find the file…