How do you make a sprite that is apart of a Sprite Packer's atlas readable?

I am unable to make a sprite that is part of the sprite packer's atlas - readable. If I change the settings of the sprite under the advanced options to be read/write enabled, then re-pack the atlas the sprite is missing from the atlas. Is it possible to keep the sprite read/write enabled and still be apart of the atlas? My problem derives from trying to save a sprite as a png onto the device, but the sprite's texture is not readable.