Is there a way to use a UIkit that i downloaded in bootstrap studio? How do i do this?
The BSS app is designed to build Bootstrap framework based sites. Ulkit seems to be another framework so the app would not necessarily work with it.
In a way you could use many of the components like the CSS, Fonts etc.. but your going to have conflicts I'm sure related to the fact that the 2 frameworks probably have different CSS media queries for break points and things like that.
To use an outside HTML source you have to add it to the app as Custom Code by using the Custom Code component. This means you won't be able drag/drop into any of the imported code. You would copy/paste the HTML between the <*body>...<*/body> tags into the Custom Code component. Then you can import the CSS and Fonts using the Design pane and right clicking the respective menu.
Saj