Now some SynerGIS files have to be deployed to ArcGIS Server.
Copy the folder WebOfficeSystem from WebOffice10.7-DVD\Software\WebOffice directories\ to <ArcGIS Server location>\directories (usually C:\arcgisserver\directories). The folder WebOfficeSystem should contain one folder and the file syn_soe_ao_gateway.json.

Content of the subfolder of the synergis directory
Important note: The file syn_soe_ao_gateway.json contains the relative paths to the files mentioned above.

Adjust file paths if different from standard paths