How to hide a photo from your library but keep it in an album

Sorry,I know this is question form but I don’t know how to reply to a question lol.I have an answer to “How do I delete a photo from my library but keep it in my album?”So first select the photo you don’t want in your library but want it in your album.Press the button that has an arrow in a square.Then scroll till you see “Hide”.Press hide and then it will hide it.Now you gotta do another step.Press add,Albums, scroll to hidden and add those.I hope this Helps!