Gcode wont load

I want to upload gcode that I have sliced in simplify3d but when I attempt to upload it from my dashboard and the file manager it wont upload, it gets a triangle with an exclamation in it. When I try to upload an .stl file it does fine. What am I doing wrong?

It’s not possible to upload GCODE to astroprint.com right now. You can however uploaded to your AstroBox’s Web UI which you can access via the box’s IP address or its .local address (http://<box_name>.local)