Implementation LibreOffice-Online Community Version in WebApp/DeskApp

Has anyone been running LibreOffice-Online in Community Version? I’m searching for an implementation in WebApp or DeskApp. My LibreOffice seems to be running. If i open

https://ucs43:444/loleaflet/5.4.2/loleaflet.html?file_path=

the following notification appears:

0_1524684800444_screenshot_libreoffice.JPG

For example: how can i edit/view a Word-Dokument which has been attached to an email?

Documentation to LibreOffice-Online (https://documentation.kopano.io/kopano_loo-documentseditor/) leaves this open.

I am thankful for every hint