I have now gones through at least 10 iterations of deleting and re-uploading and checking that there are no more greyed out screenshots. And still it is the same thing going on. Apple, your Appstore Connect tool is not built to handle the number of screenshots it expects at the resolution it expects. This is surprising. I expect better from Apple Appstore. The Appstore Gods ................... Please please please please Have mercy................. App submissions must be simpler than this ............................

I followed the advice of deleting the grayed out screenshots and reuploaded them. But I am not in an endless spiral loop where I delete old screenshots, upload new, they show up fine first for a few minutes. After that randomly a bunch of them greyed out. And when I hover over them, is says "The file has been uploaded and is processing". If I delete that file then App store UI moves the problem to other screenshots. In summary 30-40% of my screenshots end up in such a state every time I go and fix things. This is an endless nightmare for many days going on and on and on and on and on and on ....... There is no light at the end of the tunnel for me with this simple thing.