Hi @Student_Lurner,
Thank you for the message.
This message is warning you that the GPU doesn't have enough VRAM to export maps in 8K. It can be symptomatic of an under minimum requirement PC, which can lead with many issues.
That being said, the problem could also simply come from the .FBX itself. Could you share the .FBX file, so I can investiguate on my end?
Let me know.