The adapter is by IOGear and has worked with this setup on other phones. I did a little more experimenting this morning. I tried another 32gb card that behaved the same way, but I was able to mount both a 1gb card and a 16gb thumb drive. Just to see what happened I also plugged in a 320gb USB powered external drive, it powered up and the phone saw it but told me it was blank or used an unrecognized file format. It may be NTFS, I'm not sure.
Sent from my VZW HTC One (M8)
By and large, language is a tool for concealing the truth.