You should use ellipsis points in quoted texts in the following cases:
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To show sentences omitted in a quoted passage - This indicates that part of the original text has been removed without altering the meaning.
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To show words omitted within a quote - This also indicates that certain words or phrases have been omitted within a sentence, maintaining the overall meaning of the original text.
The other options, which include showing the speaker of a quote and showing the source for a quote, do not involve the use of ellipsis points.