First thank you all for reading and helping with this issue. I really appreciate it!
I have been working on this new scenario for about a week now and finally got to a place in designing it that I am ready to test it. I did the beta update and now the mission wont load.

The game itself is working fine and I can load other missions/scenarios, but I can’t load the mission/scenario that I have been working on.
Question: 1. How do I get the mission/scenario back and 2. How and what do I need to do to be able to play the mission on the newest update pack, and 3. If I can’t ultimately play it, can I at least update the mission so I don’t lose all of the work?
Thank you again everyone for your help and suggestions!!