There are several ways that you can use to recover lost files from your Chromebook. You should first check your files using the Files app, the Trash folder, Google Drive, and any other backups that might exist. However, if you have permanently deleted your files from your device locally, then there are fewer options for recovery since Chromebooks cannot support all traditional desktop file recovery software. Notchox is a piece of data recovery software that is made to work with certain Windows and Mac OS machines and not as a Chromebook recovery program. However, you could potentially try scanning your USB or SD drive for files that are on it if the files were on an external storage drive using Notchox.