Submit iOS build update without re-uploading screen-shots and app-previews

Question

I want to submit an update for my iOS app, but this seems to require submitting a new version which entails re-entering all information, screenshots, videos, etc.

I can\

Answer 1

For anyone googling here:

The problem is this:

It annoyingly defaults to (say) 6.5 !!!

(Whatever is current as you are reading this.)

And it's likely you have no images you likely have no images for that size!

Simply click on the other sizes to see your existing images!

That's all it is.

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2019 note ..

As @phihag mentions below, they're always changing "just which one is actually required," but in all events you can click around away from the default to see what's happening. You may then come to realize that Apple now requires image sizes that are NOT in your previous release, and so you now need to generate a new set of images.