Use this article when the app cannot find, read, create, or change a local file, or when the folder option is missing.
Mac
Open Settings → Permissions and confirm that local file access is enabled.
Confirm that the required folder has been added.
Review Full Disk Access, the broadest macOS permission for this, if the app still cannot access the folder.
Windows
Confirm that the Sandbox has finished provisioning in Settings → Sandbox.
Open Settings → Devices → Local file system access and confirm that access is enabled.
Confirm that the required folder has been added.
Confirm that the app is on its current update.
Review the relevant Windows permission if the app still cannot access the folder.
If access worked before
Confirm that the file or folder has not been moved or renamed.
Remove and add the folder again.
Check whether the request needs a file outside the selected folder.
Restart the app.