I can see my model after refreshing the 3D window, but I can not see any of my tasks or resource profiles.
The file that you have sent is an spx file which means it's an exported sp file.
The standard workflow is usually to export spx files directly from revit or navisworks and then import them into your master sp file and do the work there.
In this case, I think this is simply not the same file you have been working on since spx files are always read-only.
The file you've been working on should have a .sp extension.