my sync 3 update is not downloading to my usb

I have been having issues downloading the sync 3 update to my flashdrive.
i have followed all the instrustions on the youtube videos
when i start the download it almost instantly says its completed, i check my usb drive and it has has the file but there is no storage taken up. (57.6gb is free of 57.6gb)
i plug it in my 2016 f150 and nothing happens


SYNC Region: NA

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: OEM

Old SYNC Version: 3.0.23219

New SYNC Version: 3.4.23188

Do you have a error message, if so what is it?
no

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version: 2.13.3.0

Syn3 Updater Documentation Read: yes

Syn3 Updater Log File

empty 

Follow the instructions here on the site using the Syn3 Updater.

i have.

When you select the drive to download to you selected the USB drive on the computer?
Not a Mac, right?

Following Youtube instructions is not the same as what F150Chief has told you to read.

You are probably removing the flash drive too early even though the message is telling you to do so. You will see in the info that you need to ignore that first message and leave the flash drive inserted so that the system reboots and continues with the upload.
Some time later you should see a green stripe with the ‘completed’ message on it. Ensure the engine is running the whole time and do a master reset after the upload is completed.
Apologies if you are aware of all this.