Question, Do metabox created in metabox builder show up in Admin Columns Pro (https://www.admincolumns.com/). Gravity forms find the metabox's fine, but it seems that Admin Columns pro does not and wondering if there is anything I can do?
I've just tried the Admin Columns free version and it finds registered fields. What field types are you using? Because of different ways of storing data in the post meta, I think this plugin works only with the basic field types (such as text, wysiwyg, select, radio, etc.).