Follow the steps included in Bulk Importing of Videos - Basics, and then select the 'Select Files from FTP Server' option from the "Bulk Import" window.

Click on the 'FTP Browser' button. A popup will open up.

Enter the credentials of the FTP server (hostname etc), click on "Connect"

Select the files that you are interested in adding to the repository and click on the "=>" button to transfer it to the right pane. You can do this for other files.

Review the files and locations to be uploaded in the next screen. 

In the next screen, select the collection and publishing options for all of the videos listed in the CSV file and click on 'Submit'

Note: The maximum number of that videos that can be uploaded through this method is 999