“I will be sharing sessions between Pro Tools Mac and PC, but forgot to use the “Enforce Mac/PC compatibility” when I started a session. Can I convert it to compatible mode?”
You bet! Load the session on the same computer from which it was originally created. Next, go to “File” in the menu bar and scroll down to “Save Session Copy.” Choose the “Mac/PC” compatibility option and a complete copy of the session in a new location will be created with your desired compatibility in place.