How to make saved images to retain saved in Whatsapp? After some time all images in my Whatsapp look in the following way

i.e. as if I never downloaded them. Although I did.
How to make it keep images once downloaded?
Open a file manager app and go to folder
WhatsApp &gt; Media &gt; WhatsApp Images
and check if your images are still in that folder. If not, you can try downloading them from WhatsApp again, refresh the folder, and see if they appear there.