Ah Thanks. You're right about that captive portal notification browser that the upload doesn't work in. Eh, well that'll suck for people with Pixel phones then, Oh well. The way I had to get around it, was there was some option at the top right to "Use network as is", so I wouldn't have the "Sign into network" option. Using Chrome on mobile allowed me to upload.
Thanks for the advice!
Thanks for the advice!