How to select custom 9-sliced sprite as UI-Image source image?

Hi

When i try to select my sprite it doesnt appear, however all my 9 slices are selectable? If I drag my sprite to inspector instead the first of the 9 slices get selected. The image typ also changes from sliced to simple and if i try to change back to sliced i get error message: “this image doesnt have a border”

To make slicing possible i first changed my sprite mode to multiple…

You’ve literally split the sprite into multiple sprites. Instead you need to have it set to single, and set the “border” property on the sprite in the sprite editor.