Bulk Edit for custom post type list views in WordPress

I've been trying to figure this out since Friday afternoon (with no luck). We have custom post types for various content, and custom fields created with Advanced Custom Fields plugin.

Everything works great, but I cannot seem to get the Bulk Edit feature in WordPress to let me edit the custom fields. I've included a screenshot that shows my listing view. For whatever reason, I can only edit "status". None of the other fields.


Thanks in advance for your helpful suggestions!