Hmmm… to many broken variable references ( this method only sends the actual level BP, not all the associated widgets etc ).
Can you make a small project with it in and give me a link?
To make the project, just
- Make a new empty first person project
- Migrate your level ( map ) to that project ( right-click on your level file and choose migrate )
- Zip that project up ( File → Package project → zip up project )
It should only be a few hundred MB.