The Interaction may be put on something else that what you copied, either a parent element that you didn’t copied, or maybe it was a Page interaction, no attached to an object. Carefully inspect the project you’re copying from to understand where the IX sits and how it’s triggered.
If it’s a Page interaction, onLoad or something, I don’t even know how to copy and paste it to another project… One way could be creating a div, attaching a click iX to it, using the Animation of the page IX for it and copy paste it to your project, and create a Page Interaction linked to this animation.