Can't upload screenshots for my application in iTunes Connect [closed]

I try to change the screenshots of my application due to an update but apple gives me error:

A network timeout error occurred. Please try again later.

Any help?

Why can't I upload screenshots to icloud?

Your screenshots can't be uploaded because you have selected to use screenshots from either a larger display size or your app's primary localization. Your screenshots can't be uploaded because you have selected to use screenshots from either a larger display size or your app's primary localization.

How do I take a screenshot of the app store?

The easiest way is to use a tool like Screenshop - Screenshot Creator. Its a tool for macOS, which helps to create nice screenshots for the App Store very easily. Predefined screenshot sizes can be chosen for iPhone, iPad, Mac in portrait or landscape mode.

Please switch the browser to other then mozilla ... i got the same error on mozilla ... i tried google chrome and setup new app and its good and done ... mozilla have some clashes in the new updates. .

Problem Solved .. !!