So it looks like my #fedilab app doesn't show link embeds from my posts.
I'm sure this is either done to save resources or there's a switch hidden in settings to turn it on. I was worried the things I was posting didn't have the embeds working properly.
Another thing I hope gets worked on.
Disclaimer: I actually really love #mastodon
My complaints / thoughts about how to improve it and its apps are because I intend to be here for the long haul.