Hi @saadaltak ,
Firstly, the method you are currently using is to access the image resources of the URL.
Third-party URLs (such as Wiki) may become invalid over time. I think your picture cannot be displayed may be because of this situation. I cannot access your picture address in the browser.
But if you put all the pictures in the SP cloud, then I think this will almost never happen, and your pictures will be safe.
Therefore, you could use Image control to access the URL of the SP image directly.
Secondly, for more safety, you could try to save the pictures directly instead of their URL.
You could use JSON() function to convert pictures into binary strings and save them in multiple lines of text.
I think this link will help you a lot: Here
You could choose a method according to your needs.
Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.