Hello, sorry to bother you. I tried the test and did as you wrote. In Blender, I removed the scoreboards and the net behind the goal. I exported the stadium but the file was 13000kB. The original stadium had 6000kB. I put it in the game but the game crashed if I used the stadium. Then I just tried to Import to Blender, rename it according to your advice and then export. I didn't edit anything in the stadium. The file then had about 7000kB and in the game there was a crash while loading the match. Do I have to take any further steps before exporting?