On the off chance, look at the SD card and see if the little tab on the side is pushed to the write-protect position. . .Just a guess.
Did you push it in all the way on the PC?
Some are spring loaded and you need to push it all the way in, and it will make a "click" sound. Then push it in again to remove it.
Others you push in until it stops, but there is no "click".
You should see it appear in your PC's "Explorer" window as another disk drive. If not, there's something wrong. You can try re-booting your PC.
The SD card does not send data to my air or your doctor. The data that is sent to my air and your doctor is the limited data the machine stores and then sends by modem.
WELCOME! to the forum.!
Much success to you with your CPAP therapy.