Why can't a digital camera display photos?

I am a photography enthusiast, and I am familiar with the camera problem. There are several reasons for your situation: 1, infected with a virus; When you sent it back from the computer to the camera, you didn't put the folder in the card correctly. Because in many functional cameras, different types of files are put in different folders by default. For example, if you put the video file in the photo folder, it won't be played. If you put the photo file in the video folder, it will not be displayed. 3. Improper operation. Although you look as if the photos were sent back to the camera, they were not, but were sent to other default folders. 4. When the photo file is in the computer, the displayed format suffix will be automatically deleted.