Updated Shopify store theme with customized template and product collections not showing

[youngdev]

Hey there, I am building a Shopify dropshipping store connected with DSers. I was using a Shopify premium theme template where my products were showing properly in their collections and product pages. I then uploaded a custom theme and while it gives me the option to insert any collections while I am in the editor (I can see my collections and they are reflecting properly and active in my dashboard) even when I pick a valid collection it does not reflect when previewing or after publishing. How the theme is built is that I should be able to insert whatever collection and it should adapt with the images being used in the product page. Any help is much appreciated