As per Jira’s design, to ensure add-on have proper permission to complete issue import, the atlassian-addons-project-access role will be assigned to all of the permissions in project scheme automatically. Please DON’T remove it from project scheme, otherwise import will be failed due to lack of permission.
Import Test Cases to a Jira project
Launch a Jira project and then navigate to 'Tests->Test Suites->Import Test Cases TAB', following the steps in the page to complete your import.
Points to remember while importing Test Cases
Summary is mandatory to start the import.
Appropriate date format is required when processing with date fields.