Hi @aziz.dhamani
In the default Revit 3D View {3D}, is the piping and pipe fitting categories turned on? This may be different than the view you have open and are exporting from.
BIM 360 Ops uses the Revit default view for exporting the model.
Only standalone Revit files are supported. If this is a linked model, we can work with you on the linked model workflow.
Mark Mergenschroer
BIM 360 Ops
Mark Mergenschroer
Autodesk Tandem