I have been unable to import any datatype into a custom field. Simple text string, number, label, multi choice. The same fields import fine into a classic project. So is the reality that CSV import into custom fields are just not supported in next-gen projects at this point?
Hello @Sven Delmas
Thank you for reaching out.
Indeed, there are some bugs in Jira Next-gen that causes the CSV import/export functionality to don't work as expected. They are caused due to the Next-gen architecture which uses unique identities for each project, so they are not properly mapped in the External system import.
You can check the link below for more details:
Feel free to vote and watch the bug to increase its priority and also receive notifications about its fix implementation.
While we work to fix those bugs, a workaround would be to import your issues to a Classic project and use the guide below to migrate to Next-gen:
Let us know if you have any questions.