Enable JavaScript in browser

I’m attempting to submit a bug report to a company regarding their software, via their website. I’ve entered all the requisite information, and want to upload a screenshot. However, when I attempt to do so I’m told to “Enable JavaScript in your browser for this page to function properly”. When I check Safari v15’s Preferences (MacOS 11.6), JavaScript is enabled. I’ve Disabled all of my Extensions (1BlockerX and StopTheMadness), yet the problem persist.

I’ve tried the same thing in Firefox and Brave, and received the same error regarding JavaScript. I have no extensions/plugins for these apps.

Is there something that I’m overlooking? Something in the OS?