Using of content droplet in template

Hi all,
I want to use the Content Droplet “Attachements”. I want to embed it via a template in my final page (my pages are created via forms, that load standard pages, that are filled by the user). Now I want the standard page to include a “Attachements” droplet.
I embedded it but it only shows me a grey box without any data upload functionality:

What can I do for solving this?

Kind regards

Sadly, this still doesn’t work, also when I tried a different approach (adding in a footer or adding to another template, that already exists on my page).