Pick a collection from another page with liquid code

[feeledo]

Hi guys,

I'm pretty new in shopify and I obviously have a coding issue. I need to pick a collection from collections default page and insert it in a collapsible menu. I modified the code in collapsible section to have a liquid field where I can use code. Here the screenshot (sorry, in italian): 

I used this code to pick products but shopify return a LazyProductDropCollection error as you can see in the second screenshot:

{% for collection in collections['lieviti'].products %}
{{ collections['lieviti'].products }}
{% endfor %}

I've run out of alternatives. Could someone help me?

[feeledo]

Hi pearldropship,

thanks for quick reply. Do you mean with csv files method?