Saving Gcode for Longer Ray5

I’m new here, I don’t know if this is the right place for this question.
I have a Longer Ray5 10W.
I made a project and burning this with Lightburn works fine.
Since it is a repititive job, I would like to burn from the integrated SD-card-reader. So I saved the gcode and put that on an SD-card.
When I frame the project on the Ray5 it “displays” just a horizontal line, not the box containing the rectangle.
I made a simple project, just a rectangle, and this behaves the same.
Any help ? Thanks.

An update : when I start the burn, it’s OK. Just the “frame” function does not work as expected.