Do you have an overlay videos (like lower thirds) showing an animated YouTube Subscribe or Bell button (or other social media animated icons)? If not, please create some for Camtasia users in your downloadable assets library.
Hiya, I don't think they're going to add YouTube specific assets because some of their customers use Camtasia for promotional videos outside of YouTube, and some use it internally for their own company. I am thinking of creating an animation, however, I'd suggest playing with the animations yourself. They're actually not that hard to use once you get to know the tools, and how animating in Camtasia works.