Edit data in dhtmlxSpreadsheet

Hi - I used the dhtmlxSpreadsheet to insert a spreadsheet into a page on my WP website.
I would now like to edit it (convert links to clickable hyperlinks)
I no longer have the file that the dataset came from (so I’m guessing the spreadsheet data is stored on your servers somewhere?)
All I can find in the code is the following:
[[spreadsheet&autowidth=true&skin=dhx_web]]

How do I access the original doc information?
Thanks!

spreadsheet data is stored on your servers somewhere

Nope, all data is stored on your server, in the same database where stored all other data from a wordpress.