The way Arduino works now, when you press upload it looks for any arduino on all ports and attempts to flash it. So what you can do is press upload, and it will spam attempts for about 3 seconds, all you have to do is press reset during that time window and it will instantly start uploading.
This didn’t used to work before because if you did not have the correct port selected it wouldn’t attempt the upload spam, and you would have to press reset first allow arduino to find the port, then press upload.
Interestingly enough, that method, of pressing reset first, doesn’t actually seem to work anymore I’ve only been able to catch the reset button when it is first pressed.
Also, what specifically the button combo is to get to the bootloader in the FX isn’t totally finished, up-down is just the best idea we have got probably go to a vote.
So it should probably change this post too to say depreciated and make a new post about holding DOWN when you try to upload and nothing happens, which is the more common problem… but if the arduboy resets but doesn’t actually enter bootloader then that is when you need to use flashlight.