It really just depends on how massive that video file is. On my Wi-Fi, I can easily pull speeds north of 500 Mb/s, and if you're running Wi-Fi 6, you'll be looking at well over 1 Gb/s...
Even browsers tap into 3D acceleration to handle web page rendering now (I know for a fact Firefox does it, but honestly, pretty much any modern browser will). And man, you can really feel the difference when it’s actually turned on versus when it’s dead...
Aetna isn't supported here in the States. Try switching your location to somewhere else, like Canada, and see if it lets you pay then. If it still won't go through, you might just be out of luck...