My android not showing pictures in the gallery in their respective folders

My gallery was showing the images in a managed way with proper folders , like camera , whasapp, etc but after i copied some images to my SD card it start showing all the pictures without a chronological order, and no folders of course, my camera pics are all mixed up with my whatsapp images and with videos , how can i fix that so it will show videos and other images in separate folders as it was before?

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