You can select a document and save to storage when printing a document from the printer driver. You can also save the document to storage without printing.
If you are using applications made by Apple such as TextEdit on macOS Mojave (10.14), you cannot save the document to storage from the printer driver.
Click Storage Settings on the Epson Printer Utility screen.
Make settings such as the save destination, and then click OK.
On the printer driver's pop-up menu, select Print Settings.
Select Save to Storage and Print in Job Type.
Select Save to Storage to save the print data in a user storage without printing the document.
Set the other items as necessary.
Click Print.