To enable logging :
- Navigate to admin screen, click on Logging and profiling section
- In the Class/Package name field type com.mxgraph, select ALL from the New Level combobox and click Add Entry
The server log file will be located in the <confluence-home>/logs/atlassian-confluence.log
This setting will last until the server is restarted and must be re-applied after the restart.
To provide a browser console output:
- Press F12 in your browser in the tab where draw.io is opened, then click on the Console.
Right click on the console output, select Copy and paste the contents into a new file and save it.