Hello,
sorry for the late reply, i overlooked the notification.
Youre right, my input images/texturess were set to absolute - assuming that its not possible to recall the highest resolution in SP if saved in lets say 1024.I thought bitmaps have to stay in their resolution as they are no procedurals.
So now i set all input textures to relative to parent,also the base material + the project.
When i export the .sbsar to SP i still wont get the right resolution i believe,even not when i set SP to 4k.