On the printer touchscreen under the Files tab, you'll find any files loaded onto your printer's local memory or on the USB drive (if it's plugged in). You can organize and sort your files to easily locate your prints.
The touchscreen file system supports both STL and G-code files. If you select an STL file it will prompt you to start the on-board slicing wizard and generate and save a printable G-code file onto your printer. The on-board computer allows you to slice and print files without internet connectivity.