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

Topic summary

Main issue: After switching from a Shopify premium theme to a custom/third‑party theme, selected product collections do not appear on the storefront (both in preview and after publishing) even though they can be selected in the theme editor and are active in the Shopify admin.

Context: Store is integrated with DSers (a dropshipping app). Under the previous premium theme, products displayed correctly on collection and product pages.

Observed behavior: In the theme editor, the user can choose any valid collection and sees it listed, but the storefront does not reflect the selection. This affects both collection and product page displays.

Expected behavior: The custom theme’s sections should accept any collection and automatically adapt to the product images on the product page.

Verification: Collections are visible and active in the dashboard; issue persists across preview and a published theme state.

Status: Unresolved. User is seeking troubleshooting guidance; no fixes or decisions reported yet.

Summarized with AI on January 4. AI used: gpt-5.

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