When you collaborate with others using Plant 3D, P&ID Modeler for Revit now references P&ID drawings stored in Autodesk Docs.
In previous releases, P&ID modeler for Revit enabled collaboration with P&ID projects in BIM 360 Team. Starting with Revit 2021, P&ID Modeler for Revit enables collaboration with P&ID projects in Autodesk Docs.