whosyourdaty
The cable that comes with the headset works.
You don't have to be "fast to click on it", all q2/q3 notifications can always be found by clicking on the bell on the menu bar in the q2/q3 headset, select the "usb allow access one". Until you do this your computer isn't allowed access.
Once I allowed access, the quest2/3 showed up under "this PC" in a file browser window on the computer.
Then you can copy any video to the headset (or from the headset) the same way you would copy a file on your computer, just drag from one window to another.