Hi Jack,
You can try to edit the JSON file and change the post type under the field settings
, then re-import to the builder.
"settings": {
"object_type": "post",
"post_types": [
"portfolio" //here
],
"tab_style": "default",
"tab_default_active": "",
"custom_table": {
"name": ""
},
"class": "",
"prefix": "",
"text_domain": "your-text-domain",
"function_name": "your_prefix_function_name"
},