Actually, there’s no real need to edit MLT files.
Here’s how I did it:
I created a 640X360 copy of my 4K file using Handbrake which automatically adds a -1 suffix to the file name.
I make sure the original 4K and the copy are in the same working folder.
Open ShotCut and set the project setting mode to the intended output. (not sure yet that this step is necessary, but I did so as a precaution)
Import the 640x360 copy then edit as needed.
Save the project as name.mlt in the same folder as the two videos (just keeps everything together).
Remove the -1 suffix from the 640x360 copy then rename the original 4K to add the -1 suffix.
Open the saved MLT. Viola! Shotcut loads the 4K version with all the edits in place and ready for export.
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