Currently, neither the “All About Descriptions, Graphics, and Screenshots” nor the “Submitting to F-Droid Quick Start Guide” directly states the maximum number of screenshots allowed when submitting an app to F-Droid. I suggest making this explicit, either with a number or a phrase stating that the number of screenshots can technically be as large as desired.
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How many do you want? Or need?
One big scrolling screenshot app would be sufficient 
I have it on me phones from Realme.