My Cloud Home upload file ( 2TB more..)

Good evening,
I bought a 4tb mycloudhome. I would like to copy the contents of two external HDDs (about 2TB of film) directly into my cloud.
which is the fastest solution? can I connect the units directly to the USB port of the cloud and copy the contents with a “drag and drop” … or is there any other more effective solution?
I do not want to think about having to copy all the over 1000 movies that I have available through the APP for desktop … I did a test with three films … it takes a lot of time …
can you help me please?

you can connect the external drive to the my cloud home and then in the mobile app choose import from USB.