Thanks for giving feedback. The reference overlays toggle is turned off by default. Ensure that the reference overlays toggle is turned on.
LocationView 3D > Header Image
HotkeyToggle References Overlays - 'Ctrl + F1'
If it still functions incorrectly, please provide more details on GitHub. https://github.com/Kenimation/References-Overlays/tree/main
For me, in Blender 4.3.2 and 4.4.3 it not works! It not load any image in the viewport! How it can be possible?