Each EV3 Brick has an available memory of 16MB. Some of this memory is used to store example programs, graphics and sound files that are pre-loaded on the EV3 Brick when you first get it. This leaves 4MB for the files you create and download.
You can restore your EV3 Brick’s memory to factory default condition by re-installing the firmware. For details on this operation, see
Updating the EV3 Firmware. Be aware that re-installing your EV3 Brick’s firmware will delete all files in your EV3 Brick’s memory. Make a back up of any files you want to keep before proceeding!