(3.9.X) CSV Import

Exporter allows you to export your issue list in CSV format. We developed this feature to ensure compatibility with Jira's native import wizard. Please, keep in mind that Export doesn't allow you to import issues.

There are a few things to keep in mind when you are trying to import, such as how to prepare the CSV file and how to map the CSV files to the Jira import wizard. Here you will find a document created by Atlassian where they explain this process: Import data from CSV file.

We have isolated two pain points in this process and they are Attachments and Comments:

When talking about attachments, you can find further information in this document, where they explain how to import them into Cloud instances: Importing attachments into JIRA Cloud applications using CSV files
For the comments, there is a section in the documentation shared above (Import data from CSV file) that explains how to import them to Jira Cloud, where they point out the need to map the "Comment" column to the "Comment Body" when importing.

And last but not least, to avoid errors during the import process we recommend you include (at least) the next fields:

Summary
Priority
Issue ID
Parent ID
Status (if you want to continue that issues with its flow)
Issue type
Resolution

Custom fields can be imported too, by including them as "All" (fields) in the CSV export. This is a really important option, as you will be able to all the custom data from your issues.