Hello Zoe,
As you can see on the picture below, the visible thumbnails are from .gcode files generated by Cura 5.9 and the four question marks are .gcode files generated by “Snapmaker_Orca_Linux_V1.0.1.AppImage”, running on Linux Mint.
The Snapmaker Artisan firmware is up-to-date: 2.7.3
I remain at your disposal if you need further information.
Kind regards.