This is required The path to the new folder to create relative to
root.
locale
Dropbox uses the locale parameter to specify language settings
of content responses. If your app supports any language other than English,
insert the appropriate IETF language tag. When a supported language is
specified, Dropbox will returned translated size and/or user_error fields
(where applicable)
short_url
By default the function return shortened URL. Set to FALSE if you require a full path.
dtoken
The Dropbox token generated by drop_auth.
rdrop2 will try to automatically locate your local credential cache and use
them. However, if the credentials are not found, the function will initiate
a new authentication request. You can override this by pointing to a
different location where your credentials are stored.