How do I drag objects onto the workplane in TinkerCAD?
1) On the right hand side there is the shapes bar. Left click and drag the shapes from the bar onto the blue workplane.
2) When you release the left click the object will be placed.
*Still holding left mouse button
3) You can move the objects by left clicking them. Hold left click and drag them around.
*This is what it looks like upon releasing left mouse button