Whenever i click "Animation" of the object and try to make an animation, the record button won't show up. What's the problem? I have no clue. I'm new to BuildBox 3.
Unless you have animation box, you can't animate in Buildbox. You need to create your animations in Photoshop/PhotoPea(which is free) and then drag them in here to make adjustments (such as loop or not
The items that they're animating are smaller than the "Tiny" category listed in the PHB for Animate Objects. I would count the small objects as a swarm, between medium and huge depending on the number of objects used. Speed Test