What do you mean, back on the map?

Back to the picture: it is the picture you took but gave to others. To be clear, there are others besides yourself in this picture, and you are going to give it to him. Such a graph is called a back graph.

For example, some fans took some cosers and photos at the comic exhibition. When you get home, you can send a notice to these cosers in the post bar or Weibo, telling them that you can also have these pictures, which are called back pictures. I also bought something on Taobao. You took a photo of that thing and gave it to the owner, which is also called returning the picture.