Microsoft Office Online Web Editing

Integration with Microsoft Office Online (Microsoft Office 365) is available in FileCloud Server version 17.3 and later.

You can integrate FileCloud with Microsoft Office Online to allow your users to edit documents in a browser. FileCloud uses the WOPI protocol for this integration.

Administrators can configure Web Edit in the following ways:

FileCloud can integrate with your Microsoft-hosted Office online server to edit office documents.	Microsoft Office Online for Cloud Web Editing
FileCloud can integrate with your on-premises Office online server installation to edit office documents.	Microsoft Office Online Server Web Editing

Troubleshooting Office Web Editing

This issue can happen if admin has disabled "Locking" feature. To enable "Locking", navigate to admin UI → Settings → Misc tab and unselect "Disable Locking" checkbox.