What is the problem?
No image at gcode viewer tab when I click on a gcode or upload one.
What did you already try to solve it?
Search this forum, google and plugin page to see that maybe I need to enable something or install a plugin.
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware,
serial.log or output on terminal tab, ...)
MK3 with pi zero installed on its native port.