OK, that's what I was afraid of. You accidentally downgraded from your full camera resolution to less than a screen width. Here's how you do it instead.
Instead of doing a screenshot, you want to do a "frame capture". Samsung, from their Gallery app, has a single button in the lower left to do it. (It looks like a black & white version of the YouTube icon.) If you're on a different Android you might use Google Clips. Or for Android or iPhone you can use an app called Frame Grabber.
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www.samsung.com]
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support.google.com]
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apps.apple.com]
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play.google.com]
Any of these will take the full resolution image just as if it was a picture in the first place.
Also, a tip you may find handy: If you ever have a picture you're confident is clear enough to show the subject but it doesn't meet an arbitrary resolution, you want "image upscaling". Google that term and you'll find lots of sites that will give you a better resolution for free with minimal effort you your part. (They all advertise "AI" now but it's really a simpler process you want.) Here's one example:
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bigjpg.com]
Again it can't add details to a blurry pic, but it's good for meeting technical requirements.
And one potential bit of good news: If that denied shop went back on the board, you can try again and submit the same receipt with better images. I had a very similar problem last year with these same shops and I didn't even get a reply from support until after the window had lapsed. So rather than try to discuss it with people who don't reply, I submitted again and it passed. It really sucks to get denied a shop you're out of pocket on, so if you're meeting the client's criteria don't let a bad MSC interface get in the way of your submission.