When you look at your screenshot upload window, you will see the text โView All Sizes in Media Managerโ. Click here. In the iOS tab, you will see a segment that says โ6.5-inch displayโ. At the bottom of this segment you will see the text โ5.8-inch displayโ. Next to this you will see a checkbox with the text โUse 6.5-inch Displayโ. Uncheck this box and expand the โ5.8-inch Displayโ segment. Click on โChoose Fileโ, and upload your 5.8-inch screenshots.