It worked for me!
- I downloaded a flight plan from the Community Events.
- I loaded MSFS on my laptop.
- Opened the flight plan from the World Map on my laptop.
- Saved the flight plan to the Xbox Cloud Saves.
- Waited about five minutes. (wasn’t intentional, I just got distracted)
- Quit MSFS on my laptop.
- Loaded MSFS on my Xbox Series X.
- Went into World Map on my Series X.
- Loaded the flight plan from the list of available plans on my Xbox Series X!
I didn’t try to load the custom weather settings as I mostly fly Live Weather or fly Bush Trip Activities. It’s not the ideal way to have to do it, but it works!