Hi Sebastien,
Yes, it is possible to have multiple links connect to/from a symbol port(connector). I have attached a screenshot of one of the Essential Diagram samples that shows multiple links entering and leaving a symbol port.
I am glad that your evaluation of Essential Diagram is proceeding satisfactorily. Please let us know if we can be of assistance in any way.
Regards,
Prakash Surendra
Syncfusion Inc.,
CoolLinks_930.zip