Transfer/ Synchronizing eBooks between different devices

Hi,

Currently I have Digital Edition installed on my Win8 Dell Laptop, Samsung Galaxy Note 10.1, and Apple iPad 3, and sign in with the same Adobe account. I have downloaded some ACS encrypted eBooks, in both PDF and ePub format. Anybody have any idea on how to trasnfer those eBooks between those devices. From Adobe help I can only find solution on transferring eBooks between PC and eReader, not PC and tablet. I try connect PC and my tablets, while the Digital Edition seems cannot recognize the tablets, thus cannot transfer from PC to tablets. Anybody can help me with these