What browser are you using? I get a progress bubble in the lower left immediately. Here's a screenshot -- note the blue upload progress element in the lower left corner.

We can maybe visually disable the form/dialog box when you click "Submit", I suppose (see T11145).

Ok I actually get a dialog on secure., it's probably because we're out of date with the upstream.

It's possible that adjusting Settings → Notifications to No Notifications disables this bubble, if that's a compounding factor here. D18600 pulled back some of the aggressiveness of that setting but I'd guess it might still be hitting the upload progress bubbles.

We don't have a notifications server, does that make it like that?

Not unless something super weird/buggy is going on.

Hm, actually the problem here is that the notification bubble doesn't show up for any file uploads on our current version. I suppose it could actually be "on our current version + extensions". I'll get a reproduction matrix together tomorrow.

Locally, seems like "No Notifications" correctly has no effect on the "Upload" bubble being shown at HEAD of master.

If you're running something between D18457 (Aug 23) and D18600 above (Sep 13), the "No Notifications" setting was ridiculously strong but if you're more recent than that I can't think of any changes we've made recently-ish here.

From rereading D18600, maybe "ridiculously strong" is an understatement and it was actually so powerful it took effect even if you didn't enable it.

Here I was thinking I found a helpful public bug.