Any techies here ...

The documentation specifies an external adapter.

I don't know if the drone would be able to detect the update file if connected to a computer. The instructions imply that it updates by recognizing the new firmware in the root directory of an external storage device. You can try copying the firmware file to the drone's internal storage if it's doable by connecting it to your computer.

I told you Maxim was your guy.

Your flash drive is probably already FAT32. You can check it, and change (reformat) it if necessary, on your laptop. Assuming it's a Windows laptop, insert the flash drive and go to "My Computer" or "Computer" or whatever Windows calls it these days. It's the place that shows all of your drives. Right-click your flash drive icon and select "properties." On my Windows 10 PC it looks like this:

https://i.imgur.com/lnsByUd.png

If yours says "File System: FAT32" like mine does, you are all set. But if it says something else, like NTFS or exFAT, you'll need to reformat it. To do that in Windows, right-click your flash drive icon again and select "Format..." from the menu. It will bring up a Window like this:

https://i.imgur.com/wIku9ga.png

Select FAT32 from the file system drop-down menu, leave every other option as-is, and click the "start" button.

There are some unusual cases where that method in Windows can't change the file system, in which case there are more powerful tools built into Windows, such as Disk Management and the Diskpart command-line tool, and there are also third-party tools. Let me know if you run into any problems like that.

As long as it doesn't involve cell phones. I've never owned one and hopefully never will, so I know next to nothing about them. I know how they basically work (they are fundamentally just a specialized radio transceiver, i.e., a glorified walkie-talkie), but as far as the operating systems on "smartphones" go, I'm not familiar with them at all.