Select Backround image/set scale
Click to some known point in the picture. For example the bow tip. A new little window comes up showing the current cordinates. You can then replace the cordinates to be what it should be, like the bow should be at X=10m and Z=2m the change the numbers to 10, 2
Numbers for the background image are x and y positions, not scale. Scale is calculated from that.
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