I just solved this issue.
1: Go to https://mockuphone.com
2: find iPhone 8 Plus and add your screen shots (iPhone SE 3rd gen)
3- Download the images and open with preview
4- Resize the images 1242 x 2208 . Notice to set the pricise pixels you need to unmark scale proportionally
Good luck
William Farhang
Williamfarhang
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The same issue for me :
Unauthenticated Request ID: NJSTIF5IZ4T2ABAJ7KAOG6W5M****