If you plan on using Autovue, you should consider the following:
P6 R8.3 supports Oracle UCM 10g, Oracle WCCC 11g, Microsoft SharePoint 2010/2007, and CMIS-compliant repositories.
If you are using SharePoint 2007 or UCM 10g and P6 R8.3, you should not upgrade to AutoVue 20.2.
If you are using P6 R8.3 and AutoVue 20.2, you must upgrade to Oracle WCCC 11g. You will need to use the WCCC 11g Connector provided in the Tools folder of the Media Pack.