Error When clicking push changes

hi @ChungusLS ,
There is a posting from the past wich had similar problems
but needs a little bit more

Blocker - Failed to validate for upload with no discernable error - General / Issues and Bug Reporting - Epic Developer Community Forums (unrealengine.com)

With my UEFN project open…

  1. Checked-in my changes to ensure no progress is lost
  2. In the UEFN outliner I selected all everything in my game, right clicked, and clicked delete.
  3. After deleting everything, I launched my session (which works now).
    4. . Once the session was open, Push changes (nothing to basically output) comes back really quick. Close session
  4. Once the session was open, I reverted my changes (click the three dots next to the check-in / sync button → Revert All Files)
  5. After successfully reverted, I pushed my changes.

This does have some risk by “pushing an empty project” you are deletting your project and first off you could in Fornite project setting use the "Back up project " to a private project.