The output file location, if left undefined this method will return a buffer
Which thumbnail size from the document or photo to download, instead of downloading the document or photo itself.
If it's specified but the file does not have a thumbnail, this method will return undefined.
The parameter should be an integer index between 0 and sizes.length.
0 will download the smallest thumbnail, and sizes.length - 1 will download the largest thumbnail.
You can also pass the Api.PhotoSize instance to use. Alternatively, the thumb size type string may be used.
In short, use thumb=0 if you want the smallest thumbnail and thumb=sizes.length if you want the largest thumbnail.
A callback function accepting two parameters:
(received bytes, total).
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All of these are optional and will be calculated automatically if not specified.