When you open an Excel spreadsheet, one of two things will happen:
If it originally came from eaSheets, it will open in eaSheets.
You can then edit the data, or import the data back into EA.
If it’s just a normal Excel spreadsheet, it will open in the sheets editor.
In the sheets editor, you get most of the normal Excel editing functions, but you can not import this data directly into EA: eaSheets doesn’t know wnyiht g about the data.
To import it into EA, copy/paste the data into another eaSheets sheet, and save that sheet.