Hmm I drag my files right onto the dash, would be worth a try. Just drag and drop the file right into the browser.
Being distant from your machine shouldn’t be an issue.
Using edge would rule out any sort of interference by an ad blocker/plugin that is overreaching.
Since nobody else is raising a ruckus, I have to think this is something local to your machine. I just tested an upload, and it all looks good.
As for the status page: