To upload data to Impero Back:drop it needs to be in CSV format. You can save any spreadsheet as a CSV. 

Mac 

With Macs you need to Export to a CSV. This can be found under File in the menu bar. 

 

 

You can tell if it is in the correct format if the ending is .csv 

 

Windows 

For Windows you can save as a CSV. Select this option from the File Format drop down.