Help please fitting an audio track to looping video frames

I have created a very basic 9 frame/layer 'animation' and I have a piece of music MP4 which is a set length.

I want to add a looping image to continue looping until the end of the music, but am stuck on the timeline

-have converted to video timeline and have inserted the music file fine, but cannot work out how to repeat

the image file to fit to the end.

working in photoshop CC.

I just end up with blank image if I extend each layer to meet the end of the audio layer, and cannot seem to repeat

the sequence to fit it?  I am sure there is a simple solution but it is evading me : )
Please see screenshot attached.