Funny you should mention it, I just looked up the system documentation for what that small port on the front of my Dell XPS 8930 is. It is a USB 3.1 Type-C port. There's also a 2nd one in the back.
Ah, I was not aware that exFAT is not bootable. I just checked the File Explorer Properties of my Cruzer and it is formatted as exFAT. So, that probably explains why that particular 128 GB model is not a candidate in Reflect for creating Rescue Media.
With that new piece of information in mind, I checked the Properties of an S75 Lexar flash drive that I know boots and can be used for Rescue Media. It is FAT32, hence why it must work.
So, with that in mind, I decided to perform an experiment. The Cruzer was, currently, an empty flash drive so I decided to try formatting it as a FAT32 and see if Reflect would accept it then. And that was when I discovered FAT32 wasn't an option for this drive.
But, NTFS was, which apparently can be booted, so I tried formatting it as NTFS. Also, what I thought was a Cruzer may be an Ultra, as Reflect is returning it's a SanDiskUltra in the Rescue Media builder. After a 2nd format, I guess to make it bootable, Reflect created Rescue Media on this same SanDisk which had failed to before earlier in the year. I haven't tested booting it, but I've learned something, thanks!
From now on, when I get new flash drives that aren't being accepted by Reflect for Rescue Media, I'll check to see if they're formatted as exFAT, since it does seem to be the default for some flash drives. It appears to be the default for flash drives according to File Explorer's Format properties. I can then try formatting them as NTFS. I've only ever had to change the file system of one flash drive before because it didn't accept files greater than 4 GB and I had to format it as NTFS to store some Reflect backups. Or maybe it was the long file names I needed NTFS for, I forget. One of the two reasons.
Actually, the above is not a solution at all! It creates Rescue Media but formats the entire 128 GB drive as only 0.99 GB. While that solves the booting problem, it relatively destroys the usefulness of the drive for anything beyond booting as a Rescue Media. How can I get this flash drive back to 128 GB? With DiskPart? File Explorer's Format options are limited to 1.00 GB now for this drive. I'm not entirely familiar, well, I'm unfamiliar, with DiskPart, but it seems to be the only thing I can think of that might work. I tried NIBUI Partition Editor but all that's available to that is to format the 0.99 GB partition as 0.99 GB and no other options or functions available.
Never mind. I figured it out. I remembered there was a Macrium KB about DiskPart for preparing WinPE sticks. So, I loaded it and adapted the instructions in it as I needed and got it formatted back to 128 GB. A little knowledge is a dangerous thing!