Connecting my passport to my cloud

My Cloud OS 3 Personal & Network Attached Storage My Cloud
1

This might be a stupid question, but is it possible to connect via the USB port on the back of my cloud with my passport? I was hoping to be able to plug the passport in so I could have extra storage space that my cloud could use if I run low. 

2

Thank you, I’ll delete everything off of it! I love communities where you always get the help you need  :-)

Thanks!