Please note that because of Cryptomator providing the virtual drive via WebDAV, Office Upload Center 2010 will assume Cryptomator files are on a network drive. If you have “paused uploads”, it will silently fail to save files to Cryptomator and they will remain in Office cache unencrypted instead.
E.g., this resulted in Excel displaying a small message on the application status bar when trying to save to Cryptomator drive while uploads paused. But exiting Excel doesn’t show any dialog boxes or other signs that anything is wrong.
Then it’s possible to lock the vault in Cryptomator. Upon unlocking it and reopening the file, it would have lost all the changes.
Personal notes: After discovering the Upload Center alert, I saw all my save attempts sitting in Office’s upload cache on the local drive. Took me some time to get to the bottom of this as the “uploads paused” message is not very noticeable.
Notes from developers: If you’re using Office 2016 and having issues with Upload Center, make sure that
cryptomator-vault is set inside your
hosts file. See this known issue for more details. Compatibility with Microsoft Office is the main reason, why we’ve added this entry in the first place. In our experience, this little trick bypasses Office Upload Center altogether.