Can't open more than one image in outside editor

When I attempt to open more than one image in an outside editor (photoshop, evoto, etc), from the library module, select all images and then right click, and select edit in, the dialog box about selecting file type appears, however only the active image is copied as a TIFF and opened. I’ve tried deselecting all then reselecting, but no matter what there is an active image and that is the only one that opens.