iOS, cannot submit app due to iCloud backup

I’m just checking back on this question because I’m still completely stuck at the final hurdle for releasing my game on iOS. Obviously it’s extremely important to me to get this issue resolved as it’s holding up a large part of our business. Is anyone able to shed any light on why this error might be appearing. Evidently some files are being stored in the users documents folder which is then getting backed up by iCloud, but how would one go about finding out which files are the problem.

I cannot run the project on the simulator and I cannot inspect the files on the device without jailbreaking it, and even then I’m not sure how I would do it, and even then if I could find out which files are the problem there’s no method for me to insert the objective-c required to stop those files being backed up.

Is it fair to say that Unreal Engine is entirely broken on iOS currently due to this error? Has anyone else experienced this issue when trying to publish a game?