Auto flowers are homozygous recessive. Unless your photo is heterozygous, which can happen (like in fast versions), your seeds will be 100% photo but heterozygous, which some companies have been branding as fast versions but that has not been my personal experience from breeding them. If you breed those out you will have a chance of finding some auto flowers. If you want to do a long-term breeding project, I might keep autos and photos separate, I have made that mistake and now I have hidden recessive autos that could appear in seeds. Do a Google search for punnett square and you'll see what I mean.