Sleepyhead CSV data export ??

Sleepyhead has a CSV export option (detail, sessions, daily), but I'm not sure how to use it. I did scan the tutorial, but I may have missed how it operates exactly. I have acquired a session file (*.SPO2) from a Contec CMS50F, and I can see the summary report and the strip charts. I would like to download a CSV file with the raw data at whatever the sampling rate for that is, should be several thousand records. Is that an option ??? When I export a CVS file for an 8-hour session and load to excel, it's just an empty file, except for the column headings. Any advice appreciated.
THANKS !

Are you really still using SleepyHead? That is now obsolete and replaced with Oscar. https://www.sleepfiles.com/OSCAR/

Oscar can directly import and display your oximeter data. It also creates a CSV file with a lot of detail - I just used it and my 7.5 hour sleep last night generated a ~450kb file.

THANK YOU Respirator99 !
That works ! Much appreciated.

(I haven't messed with the software for about a decade, no surprise the legacy tools don't operate as expected)