If you're trying to open or use SyncWith for Google Sheets, and you receive an error Authorization is required to perform that action for example Failed to display the preview dialog: Authorization is required to perform that action. (showModalDialog) what this usually means is that the current Google account in your browser hasn't installed our addon.
To solve this there a couple of options:
If you've got multiple Google accounts logged into your browser, see our article about how to manage multiple logins with Chrome profiles or log out of all but one user
If the current Google account in your browser is the one you want to be using with SyncWith, then likely our addon has not been installed under this account, so we recommend you try installing it under this google account
