Breaking up large files

Is there way to get a range of bytes from a document stored in Appian.  We have process that takes Documents in Appian and uploads them into our document management system via a service on our end.  Larger files (15+ MB)  tend to time out.  We have a resumable service but it requires that we can break up the file into chunks to send separately.  Is there a way to do this in Appian or do we need to write a custom plug-in?

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