Can't upload files to github - HTTP ERROR 400, crbug/1173575 - github

I'm trying to upload some images to my github repo. In Firefox and Firefox developer edition, I'm getting a blank screen after I click "Commit changes", with an error in the console:
The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol.
In Chrome and in Edge, I get a mostly blank page with:
This page isn’t working. If the problem continues, contact the site owner. HTTP ERROR 400
And in the console:
Failed to load resource: the server responded with a status of 400 ()
VM9:7146 crbug/1173575, non-JS module files deprecated.
I can't find any information about what might be causing this and it doesn't seem to be happening to anyone else - it was working fine this morning, but is now failing in all browsers.
Edit: This is happening in both my Github accounts, so is not account specific.

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From my PC, it looks like your site is now up, and displaying a Hello World page. If you still cannot see it, it may be that the 404 page is cached by your browser - try emptying your browser cache (on Chromium-based browsers including Google Chrome and newer versions of MS Edge, this is done by opening the Inspect Element tool, clicking-and-holding the reload button and selecting "Empty cache and hard-refresh")

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The error you're getting is related to a missing favicon.ico file. Even though your HTML code doesn't specify a favicon, browsers can request it and display an error. This shouldn't be a problem with loading everything else, but you might want to either add a favicon picture, which will probably be better for your site, or find a way to avoid the favicon request (see How to prevent favicon.ico requests?, for example).

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