Selecting the Export option from the Library will open this page.

Target Folder: Files will be exported to this location. Note: this option will only show Export locations, not Video Folders. For an explanation of the difference, see Folders.
Copy Auxiliary Files: SRT files containing closed-captioning information will be copied along with the video files, along with other additional files such as SmartChapter XML files.
Create Metadata XML: An XML file containing library information (title, channel, description, etc.)  for the item will be copied along with the video file
Remove Metadata from File: All Library metadata will be stripped from the file. This is useful for compatibility with certain third-party video editing programs. 
Upload Thumbnail: Includes a JPEG snapshot of the first frame of the video

Click Add More to select additional items to share from the library in this session. Note: this will create a Working List for the Export feature.

Click Clear List to remove all of the existing items from this session.