That is the default behavior, the data value is set to the saved file name, if you want the original file name then you can change "filename" to "name" in your shortcode in the save overrides!
Best regards
Max, ChronoForms developer
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Because the filename is the ACTUAL name of the files after they're uploaded to the server. By default a timestamp is added so your files don't get overwritten. If you do what Max said, it will save the original name of the file the user had on their device to your database which will NOT work for you, because it won't point to the file on your server.
