Unable to view my pics in Gallary

[KaziDeakin]

My picture cannot be displayed in my Samsung gallery. I have all my pics in my phone but unfortunately I cannot view it in my gallery. Only new pictures I capture from the camera will be visible in the gallery. New downloaded pictures will not be visible in gallery but available in the download folder. I can still view the old and new downloaded pics if I go to the folders but all these pics are not being displayed in the gallery. How to fix it? I want all my pics in my gallery just like before.