EXR and Image Plate with Alpha

I am using 4.18 and attempting to use and EXR for the image plate background image. I can see the EXR has embedded alpha but when applying it to the image plate as a render texture it does not seem to respect the alpha.

Does anyone have suggestions on where I might find a tick box or other that would allow the image plate to utilized the alpha channel in the editor?

Many thanks,
Greg

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