You can connect a Folder in the File Vault to a folder in Google Drive as a "watched folder". When files or folders are added to the Google Drive folder or any of its subfolders, those files are automatically imported into Mediagraph.
You must first connect your Mediagraph to your Google Drive account. Once you have done that, you will see a new item in the Folder Info Popover that allows you to choose a folder on Google Drive to be a watched folder.
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Once you have selected the folder, the dialog box will show the selection.
Whenever you add something new to this folder, it will be added to Mediagraph.
Here are some additional details.