.fdx files undiscoverable/hidden


I've recently downloaded Dubscript onto my Inspiron 3181 ChromeBook. I want to open a file in the 'read' section of the app but when I search fo the .fdx file currently on my hard drive, nothing appears to be there.

Ive uninstalled the app more than once. Restarted twice. And i've changed my Files viewer settings to show hidden files. I'm unsure about how to move forward with solutions.

Any help would be appreciated.