Add-in is not appearing
If the Add-in is not present, follow the steps in the Quick Start to enable the Add-in.
Desktop Outlook - Add-in frame appears but content is blank
For reasons best know to Microsoft, even though the Add-in is a small block of code, the first attempt to run an Add-in can lead to it being partially loaded. Leave it for 2-3 hours then re-start Outlook. It should then load as normal and will be fine thereafter.
Mobile phone - extreme case
If your phone has an expired SIM card, the Add-in will not load. Replace the SIM card with one that you know works or remove it completely, whilst ensuring that the phone has a data connection via wi-fi.
CloudFiler still not showing in Outlook desktop?
The CloudFiler icon will normally appear automatically but if it hasn't appeared within a sensible period, you can find it by selecting All Apps from the Outlook ribbon menu,
then select Add-Apps,
from the menu on the left select Built for your org and then CloudFiler
Then pick Open