If this video doesn't work for you, you can check the Lumion support webpage which has about 9 solutions for this problem.
Lumion support link: https://support.lumion.com/hc/en-us/a...
If you need help regarding the software you can message me on my Facebook page, Whatsapp or Viber. I will remotely use Teamviewer.
Note: This is not free
Facebook page: Cravshop
WhatsApp:09186101362
Viber: 09186101362