Hey Guys,
thanks for your help so far. I will send you the following link. That file is a ZIP and includes four trees (2 obj, 2 fbx). Maybe you can check out if you got the same problems like me.
Link to file:
For :
It is even the same problem if I download a tree from another plattform. Every tree looks like that. For me it seems to that the problem is not caused by speedtree or plantfactory. Your mentioned dialog does not appear if I export the file. So I do not know.
But I am really thanksful for your help!!!