Did you have a handy copy of your vehicle registration when signing up?

I assumed that like me, most people immediately throw away the receipt for their vehicle registration as soon as they get the windshield sticker. Is this not true? If you had to get a "registration card" which I've never heard of in texas, can you do it online? Is the "registration receipt" sufficient? Is a photo of the sticker on my windshield sufficient?

thanks-