I have found a solution to be able to import and export files in Fusion 360.
This works also, when you will safe your rendered files on the Rendering-Workspace to your computer without having to crash the program.
But it's important, that this solution is only good for this tasks now and it's better when you go to preferences and in General under Graphics driver, select "DirectX 9" for this one, because so it works faster and without glitches. ;-)
Watch this video, then can you see it the problem and my way to solved this problem. :-)