I am working in RGB and an Alpha 1 channel (Near Infrared). I am grabbing pieces of one flat TIFF and copying to another flat TIFF in new editable layers. I have to have all 4 channels able to copy, paste, and even edit (layer masks, etc,). For example, I have to get a section of straight bridge in a TIFF containing all 4 channels copied onto an editable layer on top of a section of warped bridge in another TIFF, so it needs to be its own layer that also contains all 4 channels. When the RGB channels are turned off, all the edits I made should also be visible in the Alpha channel.