My TURBOTAX expert doesn't know what to do with my cashapp .csv file and neither do I

I don't understand the long winded directions people are providing for finding your cost basis for bitcoin sales when the cashapp .csv file won't upload.  It won't upload for the expert and they are hounding me for the basis.  I am a total newb.  IF anyone has any ideas how to help an idiot like myself, I would be forever in your debt.