Thank you for reaching out to Atlassian Community!
Just to make sure that we are on the same page, are you using an add-on to export issues from the customer portal?
I’m asking this because currently, Jira doesn't have this functionality. We have a feature request suggesting the implementation of this ability:
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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