Working with several clouds is more common nowdays. It is very easy with Air Live Drive to work with several clouds in your computer and transfer files from cloud to cloud.  If you have accounts in Google Drive and Naver, you can move files between them with only one program.

First you have to add your Google Drive and Naver accounts to Air Live Drive.

Assign the Google Drive and Naver accounts to a disk drive.

Open your clouds in the Window Explorer.

And drag/drop your files between the clouds.

You can check more information here:
-Transfer files from Box to Google Drive
-How to transfer files and folders from Google Drive to Dropbox
-Copy files from Onedrive to Google Drive with Air Live Drive