Sets a sequence of files as the proxy of this AVItem, with the option of forcing alphabetical order. Loads the specified file sequence into a new FileSource object,setsthis as the value of the proxySource attribute, and sets useProxy totrue. It does not preservetheinterpretation parameters, instead using the user preferences. If any file has an unlabeled alpha channel, and the user preference says to ask the user what to do, the method
estimates the alpha interpretation, rather than asking the user.
fil e An ExtendScript File object for the first file in the sequence.
forceA lphabetic al When true, use the Force alphabetical order” option.