Yea, he provided vital information to me.
And thanks to all the testers
I think we can use images up to 100kb. I tried 15kb so far.
Very important is the image format
400x234 pixels
96x96 dpi
bit depth of 8
1 frame
GIF89a file type
I used 72dpi and got a programming error.
Maybe someone tries animated gifs?
Tino