I have no idea where to report bugs for this Tinkercad site. I haven't noticed a link or prompt anywhere... I lost 45 minutes of work, because my undo function froze after 6 or 8 undos, preventing me from returning to my usable project. I was merely experimenting with a couple moves, then was prevented from going back. Now I have to start over.
Also, the snap-to-grid isn't working at all. I have it set to .5mm, but it's dropping my objects at .01mm, taking forever to position my pieces correctly.
What's up with that? Where's the support page?