Whilst CloudFiler looks the same on mobile devices, there are some differences that you need to be aware of. For example to access the Add-in you will need to select the triple-dot menu as seen in the video below. In addition, the Add-in can not appear when sending messages (this is a Microsoft security feature) you can however file them from the 'sent items' folder.

NOTE: The Add-in may not appear immediately on your mobile device. Take a look at the section entitled Add-in not showing on mobile device for details.