I am modelling a picker that pulls tubes from a rack and transfers them to another rack. i cant figure out how to get the crane to pick the (just one) tube out of the rack container and place it into another container stored within a floor storage. i have tried a subflow but i cant get my event source to work. currently im using the photo eye to send to destination and use crane as transport. everything works when i take the container out of the equation, but that leads to new problems.