Can we add Vusers during a test run in Performance Center 12.62, and how would we do this?

We are currently using Performance Center 12.62 with Windows Server 2016. We are facing issues with File transfer activity from Performance Center. We receive the following Error message: "Upload_Image.c(8): null or empty","path":"/companies/134357/documents/14bc2029-36b4-49bb-9c...

We just upgraded to PC 12.62 and have verified that all my users can login to the My PC for their projects; however, no one is able to connect to new ALM_PC, projects from within VuGen. When I go into VUGEN and click **"Version control" ->ALM ->ALM Connection** enter the server, username and...