Just to clarify your question, are you talking about Adobe Document Cloud (which is associated with Adobe Acrobat and Reader) or Adobe Creative Cloud (which includes Creative Cloud desktop app, CC Libraries, CC Files, etc.)? They are two separate cloud services (along with Adobe Marketing Cloud) which Adobe has created.
Both I have. So, I d like to copy of PDF on ADC and paste onto ID on ACC.
How can I do ?
You may be able to view a PDF which you have opened on one of your devices (computer, phone, tablet) by opening it on the Document Cloud, you can view it because a copy is downloaded from ADC to Acrobat or Reader on your computer.
But to use the content of the PDF you need to save a copy of the PDF onto a drive on your local computer, or have access to it on a network.
InDesign doesn't handle PDF files by copying. Instead, you would choose File > Place and place the PDF you have stored on your local computer or server. By default, InDesign maintains a link to the PDF on your storage location.
One more point: InDesign is not stored on the Creative Cloud. It is downloaded from the Creative Cloud to your computer, and you run it from that location.
CC provides a file sharing service that is similar to Dropbox where you can synchronize files on your local computer with your account's cloud storage. Here's the documentation:
On OSX the sync folder is at the root level of my user folder. So here I have a folder in my Creative Cloud Files folder named Rob's Images. Any image I put in that folder get sync'd to my cloud account:
From your Creative Cloud App you can choose Assets and click View on Web to see your sync'd files:
From the cloud page you can choose to share assets with other users, but if you want to place an asset in an ID layout you would place the local version.