We have tried importing issues using CSV file containing 20,000 issues. But only 250 issues can be imported successfully, it throws an error message "Current JIRA settings allows you to create only 250 issues via single CSV file. Please check Advanced Settings to adjust this value".
How can I solve this issue and import them into project?
Unfortunately, the 250 limits cannot be raised in the Cloud environment for performance concerns. There is however a feature request for this:
I would encourage you to visit the feature page linked above and click the *Watch* link near the top right to be kept informed of progress on the request going forward. By doing this, it will ensure you're proactively informed of progress and updates going forward in accordance with our [Implementation of New Features Policy|https://confluence.atlassian.com/support/implementation-of-new-features-policy-201294576.html].
Please let me know if you have any questions!
Atlassian Cloud Support
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