HTC One M8 for Windows - Manual (Page 183)

Free up storage space by transferring files, photos, and videos to
your computer or by uploading them to OneDrive. To learn more,
see
Keeping things in sync on page 189 and Backing up your files
on page 191.
Checking phone info
You can find out various information about your phone such as the
Windows Phone software version, RAM size, screen resolution, and more.
1. Swipe down from the top edge of the screen with one finger.
2. Tap All settings > about.
3. Tap more info to see the Windows Phone update version and other
details.
Settings 183