No option to mount my SD card on HTC M9

[AC Question]

I have a htc m9 and I have went to settings on my phone and it has a option called "storage & USB" but it doesn't have a option to mount my sd card but when I look it up online it appears that my phone is suppose to have this option. Where can I find it? Is it possible I turn off an option to see the mount feature?

 

[Rukbat]

It should automount. There's an option to unmount it. (Although I still turn the phone off to insert or remove the card.)