Manual Firmware Upgrade with WebUI Won't Go Past 0%

I do manual firmware upgrades in my environment. I’m currently at 2.31.195 and wanted to manually upgrade to 2.31.204. Trying to do so open the WebUI to do the firmware upgrade and shows 0% complete. This used to show progress for me in the past but no longer does. I’ve been very patient, but it shouldn’t take hours.

Any idea how to give this a kick?