Transfer photos/videos from external hard drive to icloud

Hi,

I have 2TB of icloud storage space, barely used. I also have about 100GB of photos and videos in an external hard drive. My Macbook Pro device storage space is 125 GB, of which 30GB is available.

I am trying to move my photos/videos from the external hard drive directly to my icloud storage space. When using Photos app on MacBook Pro, it tells me that there isn't enough storage space. I concur that I am not doing the right thing as it is trying to transfer to my McBook device's storage space first.

How can I transfer photos/videos from any external hard drive directly to the icloud space?

Note that the external hard drive is a Seagate Model # SRD00F1 that can be used on PC and Mac.

Regards