Ask her to resize it to correct size of the background when she finishes
One panel:
640 x 1136
Two panels:
1280 x 1136
Three panels:
1920 x 1136
How to upload as a background:
Ask her to resize it to correct size of the background when she finishes
One panel:
640 x 1136
Two panels:
1280 x 1136
Three panels:
1920 x 1136
How to upload as a background: