To enable thumbnails, open the Advanced tab in the printer settings, enable the GCode Thumbnails for Octoprint and Mainsail option and enter your preferred square format image size in the Resolution fields (e.g. 400 X 400). It's necessary that the thumbnail width and height resolution is equal.
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{% embed url="https://www.youtube.com/watch?v=EbtLn3bDs5I" %}
To have the full metadata support, you have to add the following lines to your start G-code:
;Nozzle diameter = {machine_nozzle_diameter1}
;Filament type = {filament_name_abbreviation1}
;Filament name = {filament_name1}