Projects plugin issue

I have a problem with displaying photos in projects plugin. I create a slug, add it into a plugin field, but it show all pictures that I created. But I need only one, not all of them. Please help to solve the issue. Thank you.

Hello there,

Any link to the projects plugin do you use? So I can try it on my test site. Also please, share a link to your projects page to allow me checking it directly.