Bootloader Update on FRDM-K22F

I have a problem upon trying to update the bootloader. I was following the instructions on this article: DAPLink bootloader update | Mbed.
Step 3 mentions to open the device’s (which is mounted in bootloader mode) root directory and drag and drop the downloaded bootloader image but while doing so, I encounter an error, “Destination Folder Access Denied”. (I do give admin permission). How do I resolve this?

Is it possible this is a corporate computer that doesn’t allow writes to external media?

Yeah it is. I got the issue that cropped up. I will try it with my personal computer.
Thanks a lot!!!