When you open a MS Office document from you cloud hosted server, you may see the option to ‘Enable Editing’ at the top of the page each time. The cause is because your cloud hosted server is not a ‘Trusted Location’ in Office 365. To add your cloud server as a trusted location, follow these steps:
1. Open Office 365 (Word or Excel)
2. Click File > Options.
3. Click Trust Center > Trust Center Settings > Trusted Locations.
4. Click Add new location.
5. Click Browse to find the folder, select a folder, and then click OK.