Hi Aleem,
Thanks for reaching out. From what you've described, it sounds like the ETL file that was captured might not have been merged with XPerf. The merging process is crucial as it incorporates essential metadata required for decoding trace information, including symbol decoding.
Here's the command you can use to merge your ETL files on the capture device:
xperf -merge input.etl output.etl
After executing this command, try loading the output ETL file in the Windows Performance Analyzer. The "Load Symbols" option should now be active.
Let me know if you continue to run into issues, happy to help out!
Thanks,
Tristan