Build a correctly formatted Jira bulk-import CSV without wrestling with column names. Select your fields, fill in your issues, download the file.
Check the fields you want in the sidebar, fill in rows in the table, then hit Download CSV. Import into Jira via Project settings → Import issues → CSV.
PROJ-42). The Epic must already exist in Jira.Story Points, Story point estimate, or your custom field name. Adjust in Jira's mapping step if needed.