We found out nuget.org supports symbol packages, we are working our way through our existing catalog and re-publishing with explicit symbol packages.

Previously we were putting the PDB files into the main package.

To take advantage, you must use nuget source v3 (https://api.nuget.org/v3/index.json), and add the nuget symbol server https://symbols.nuget.org/download/symbols to your list of symbol servers in Visual Studio. See Specify symbol (.pdb) and source files in the Visual Studio debugger for details on that process.