How to Save Edits on Android/GrapheneOS?

I installed Collabora for Android on my GrahpeneOS phone. I also use Proton Drive for my cloud storage/device sync.

I can open a file from my Proton Drive in Collabora (.ods) and I can edit it but the changes are not saved to the file. I can’t find a user guide but based on other posts I believe that the changes should be saved automatically when the file is closed. If this isn’t the case, how are changes saved?

I’ve set the file to be available offline in Proton Drive and I can’t find any file permission settings that may be an issue.

Any suggestions on what I’m doing wrong?

After someore searching, found some other posts saying there were issues with saving to Proton Drive and was able to save after downloading the file to local file system.ust be an issue with Proton Drive.