From Office 365 in the Safari Browser.

Log into Office 365 at

Select One Drive from your Apps.

Select Upload from the top of the screen.

Select Photo Library from the list.

Select Camera Roll

Select the pictures you want to upload.

Click on done, these pictures will now upload.

One Drive will display your progress you can click on Uploading X items to see it's progress.

You will then be able to access these images from your One Drive account on any PC.