Problems with Ground Material for Landscape (again^^)

Of course I created the (Wheigt) Layer Info woth clicking the + button.
All also rightclicked and filled the landscape.

Edit: I want to upload the last image to show you the problem.
For some reason, I can’t upload anything more, even in an other "comment’.
So, the landscape is just black and the preview in the landscape tab look very strange (a sky blue with ice blue, I know bad description), but they also all look the same, which is simply wrong.

I hope you can help me with that, I am not good in Unreal, I am a 3D Artist.

Kind Regards,
Toby :wink: