For use with Vision, I recommend using a scheduled script to save the report bytes into a blob column in your database. Then you can query for that and load the bytes into Vision's PDF Viewer. (The report viewer re-runs the report, which it seems you don't want.)
If you are planning to switch to Perspective, it is a bit more trouble, as Perspective needs a URL to view saved PDFs. Help for that is in alpha:
{ / shameless self-promotion }
If you must use network file services, you should follow this documentation to set it up for Windows:
https://docs.inductiveautomation.com/display/DOC81/Mapping+a+Network+Drive