No files uploaded after new Dropbox app

[ghost]

Dropbox backup is set as on screenshot. When I click on "Take Backup", no errors but only database gets uploaded, no files.
Only files created after connecting to new dropbox app gets uploaded.

I did next:
Connected ERPNext to Dropbox app.
Click on "Take Backup" button. Backup was successful, no errors.
After sometime I changed Dropbox. New backup was successful, but only database, no files.
On second backup, only files created after connecting to new Dropbox app are uploaded.

I guess that's bug, not a feature. Is there any way to fix this bug?

ERPNext: v12.23.0 (version-12)
Frappe Framework: v12.20.0 (version-12)