Starting from this version, it is now possible to update existing issues Tests when importing Test cases from CSV fields.
You just need to map the Issue Key field, with a key column in the CSV file and Xray will update the existing Test cases in Jira instead of creating new Test issues.
When updating Test Cases:
Manual Test Steps will be overwritten with the new Step specification as declared in the CSV file (including any Step Step custom fields)
All other issue fields (Native and Custom Fields), will be updated according to the same rules of theJira's native CSV importer.