inputMediaPhotoExternal#922aec1 flags:# url:string caption:string ttl_seconds:flags.0?int = InputMedia;

-- flags:#

-- ttl_seconds:flags.0?int

messages:vector<%Message> = MessageContainer;

<%Message>     >>>>>       what does mean?

int ? = Int

4*[ int ]     >>>>>    what does mean?

vector {t:Type} # [ t ] = Vector t;

{t:Type} # [ t ]    >>>>>    what does mean?