Why can't I add a specific product to my collection in navigation?

Hi, so I’m trying to add a product to a collection which I can’t do because one I’ve created the collection and search for it it isn’t there and then when I try and add only one product to a navigation menu it doesn’t come up with specific products it only comes up with all products.

@bottleplugg
Welcome to the Shopify community!
Thanks for your good question.
Please share your store URL.
So that I will check and let you know the exact solution here.

@bottleplugg Please send me store url.