Composition mode

Hello Scrivener heroes.
Just a question about the composition mode. In the new Scrivener version for windows (Hurray) I can’t find where to put my own picture in composition mode. One of my favourite features. Where can I find it?
Kind regards
JK

I think it’s at Options->Appearance->Composition Mode->Colors->Texture.

But I tried that and it didn’t seem to work. Then I tried the same texture on the Mac, and learned it was too large. The Windows app probably has a similar limitation … but it didn’t check the file size until later.