Local Copy Updating

Local Copy Updating

Having set up my spreadsheet on an external hard disk, I can then get it onto Zoho using Import.
 
I then edit on the site and want to get that back to my PC. I can do that via Export.
 
The problem comes in when I want to edit locally again. The file saved via Export is on my external hard disk but when I imported it seems a copy got made in my user profile and it is that file I have to use if I want to edit again locally and save to Zoho. However I may not have access to that PC at that point so the only thing I seem able to do to update Zoho is use Add and from the external hard disk copy. However, that creates a second sheet on Zoho and that is not what I want.
 
What I want is quite simple to explain. I want to be able to work on Zoho and get the end result on my external hard disk and then work on that local file on any PC after which I can modify the original on Zoho. It looks like the only option with an external hard disk is to keep replacing the Zoho copy. Is that the case please? If I can do what I want, how?

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