The sticky behavior works in the following way:
When the user loads the add-in for the first time, the One-Time tab would be selected by default. Also, if the user clicks on Autopilot, that
Updates to this threadoption would be selected by default.
Once the user selects the Autopilot tab, and chooses
To/From/CC, the next time user open the app to save an email, it will default to
Updates to this threadevery time.
If you select the
One Timetab once, that will remain sticky, and on each email, the same tab would open.
Sticky settings are stored in the browser's local storage. If at any point the local storage is cleared, the default behavior would apply which is One-Time.