Creates a new folder in the Media Manager.
The createFolder() function returns a Promise that resolves to the created folder.
Use the parentFolderId parameter to specify in which existing folder you want the new folder to be created.
If no folder is specified, the new folder is created in the media-root folder.
You can only call this method when authenticated as a Wix app or Wix user identity.
Folder name that appears in the Media Manager.
Options for specifying where to create a folder.