Error saving after "uploading"

Error when saving in App AndroOpenOffice after Cryptomator reports “Uploading”, see screenshot

This is how the error occurs:
Cryptomator open > open doc file with App AndroOpenOffice >

edit > save ==> it works!!!
then Android button “Current applications” > select Cryptomator
==> message from Cryptomator “Uploading”
then Android button “Current applications” > select AndroOpenOffice
then edit > then save ==> error message!!!
Best regards Norbert