If your sync or backup is stuck or you have errors for your transfers via Uploads, and you get the error message "pCloud doesn't have permissions to sync/backup this file.", your file is read-only or locked by another application.
Check whether your file is read-only and un-check by following these steps:
Another thing you can check is whether the folders and files you originally added have been deleted or moved from their original location.
In case a folder has been shared with you by another pCloud user, please check whether you still have access and Edit permissions to it before adding it to Sync, Backup or Uploads.