I almost always save all my pms especially bst pms. Saving them really helps if something goes wrong. However there have been times where I forget to check the box and my mesage isn’t saved. While I haven’t run into a problem yet I think out would be easier just to make the box checked by default and give you the option to uncheck it if you dont need to save the message.
Set it in your profile >> Personal Message Options
Check the box for: Save a copy of each Personal Message in my outbox by default.
Wow I feel dumb now I didn’t even know that was a setting I could control.