When you look at your screenshot upload window, you will see the text ‘View All Sizes in Media Manager’. Click here. In the iOS tab, you will see a segment that says ‘6.5-inch display’. At the bottom of this segment you will see the text ‘5.8-inch display’. Next to this you will see a checkbox with the text ‘Use 6.5-inch Display’. Uncheck this box and expand the ‘5.8-inch Display’ segment. Click on ‘Choose File’, and upload your 5.8-inch screenshots.