I eventually got Symbol Debugger to pick up the workspace. The trick was to have the Symbol Debugger (basically the compiled UE4 folder) under the P4 workspace folder when launching. After that, I set the *.dmp file and depot name to //depot/MyProject/ I click Inspect and nothing happens. Perhaps it’s the symbol store? I’m not entirely clear on that point. I configured it in VS2015 and and the engine .ini file to point to MyProject/Binaries/Win64.