Note: Your photos and/or videos (taken with your iPad/iPhone's camera application) will need to be stored locally on the device for this process to work.
Open up the OneDrive application. If you do not already have it installed, search for Microsoft OneDrive in the App Store and select Get.
Navigate to the location within OneDrive you wish to upload your photos/videos to and select the “+” from the upper right of the screen.
Select Upload from the drop-down window.
Select Photos and Videos.
Select Camera Roll.
Tap the photos and/or videos you want to upload and select Done in the upper-right.
A status bar will appear indicating the upload progress.
Once completed, a copy of the photo/video will be on the iPad/iPhone locally as well as in the OneDrive location that you specified.
Note - This document is verified as of 04/24/18. Microsoft continues to update and change the OneDrive iOS application and add new features.