Local Storage not Working

Hello, I have hired a developer to build a webOS app specifically for the StanbyME Go. I’ve managed to install the app they built, using developer mode and node.js. However, any buttons that upload content from a USB drive to local storage do not work at all. The buttons simply don’t do anything. All of the other buttons seem to work fine.

Is there anything that I can ask our developer to check?

For security reasons, apps cannot access USB. Thank you.