When on the results panel of a calculation, tap Save Calculation to display the filename dialog.  It is not necessary to add a file extension.  The filename will be pre-populated with a default filename, alternatively this can be cleared / overtyped with your own filename. 


A screenshot of a computer??Description automatically generated


Figure 24 Save Dialog


Saved calculations are stored on your device and can be accessed by tapping Saved Files on the Main Menu.