pastera
NES Member
Look at the extension of the fileI have this now but the bed just moved back to front then stopped. Not sure if it is going through some kind if pre-print check
*.gcode.gz
That's a compressed file and the printer can't hande compressed
Download CURA slicer - it will associate with STL files to slice them and if you have the SD card in a USB reader attached it will default to save the resulting code to the SD card.
I can set up a team's meeting and walk you through setting up CURA by sharing my desktop (low risk on your side)