How do end users request audio messages sent through Line Official Account?

I would like to know how end users can request an audio message when it is sent through Line Official Account.

For example:

  1. Do end users directly request the file by accessing the originalContentUrl I sent?
  2. When Line server receives a broadcast API call, does it download the file from the originalContentUrl to Line server, and then end users request the file from Line server?
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本当によろしいですか? question.vm