In the Documents directory and in the TurboTax folder there is not a file with a Name 2020 (Your Last Name Your First Initial) Form 1040 Individual Tax Return.tax2020 with a Type TurboTax 2020 Document?
Is there a file with a tilde (~) in front of the file name in the TurboTax folder?
Have you looked in the Recycle Bin folder?
