Users discovered a pretty bad problem trying to use the Asset Warp Tool and Classic Tweens. If there's any part of your artwork outside of the Asset Warp container when you try to apply a Tween, Animate pops up an "error" message explaining that you need to convert the asset to a symbol for the tween to work. DON'T DO THIS! Converting it to a symbol doesn't fix it. It actually makes the problem worse. Watch the video and let me know if this helps you in the comments.