Custom Fields functionality has moved to Manual Attributes.
Custom Fields are no longer supported when performing Manual Imports. Your current Custom Field Data is still present and can be accessed.
Please transition to utilizing Manual Attributes for long term support. For more information, please review: Manual Attributes Overview.
If you have any questions at all, please don't hesitate to reach out to us at support@cerkl.com or use the support Chat toward the bottom right-hand corner of any cerkl.com page.