Microsoft Office Online to allow your users to edit documents in a browser. You can integrate FileCloud with 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.
FileCloud can integrate with your on-premises Office online server installation to edit office documents.
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.