We realized that 'linked documents' in Velocity are only available as a plain text. In the old Collaboration Hub version you were able to click on each document and access it. Currently, you have to search for it through all elements.
This is a known issue and it has been already reported to our development. If you are affected by the bug and want to ask for a status, please contact us via the support portal and refer to the ticket SPM-9493.
KBA , BPI-SIG-HUB , SAP Signavio Process Collaboration Hub , Known Error
SAP Process Collaboration Hub by Signavio all versions