So you’re wanting to create posts based on custom post types? We’ll have to look into why Gravity Forms isn’t seeing these custom post types, as it should work in theory. Have you tried using the latest beta release? There was an issue related to a “public” flag in the MasterPress custom post types being incorrectly set, which might help.
MasterPress 1.1.5 is now available. This release contains 2 very important compatibility fixes; PHP7 and WordPress 5. We have also: Fixed hardcoded http link to Google Maps JS (replaced with https)Added new “Google Maps API Key” field to Settings > MasterPressFixed Visual/HTML Editor tab JS bug Please install this update as soon as you can…
MasterPress requires a minimum of WordPress version 4.9, MySQL 5.6, and PHP version 5.6.20.
We also recommend that PHP is configured to use a memory limit of 64MB per request (128MB may be required for sites with higher complexity).
This plug-in is not compatible with the WordPress.com hosted service.