Must be saved to CXR, which can then be renamed to an EXR file type after saving in order to load it into other applications. If loading into Photoshop, Exr-IO is required (the latest version, with cryptomatte support).EDIT - also see this thread, https://forum.corona-renderer.com/index.php?topic=35535.0 the same things apply in terms of settings, both in the element/render pass, and for Exr-IO :)