The documentation was very thorough and well written. It's a great and detailed plugin.

The following message appears only on the top page, even with server security turned off.
「An unexpected network error has occurred! One or more WordPress plugins tried to call the WordPress REST API, which failed. Most likely a security plugin, a web server configuration or active ad-blocker extension installed on your browser disabled the REST API. Please make sure that the following REST API namespaces are reachable to use your plugin without problems:」
It says "without problems:" but there is no error beyond that. However, the plugin seems to be working fine.

I would also be relieved if custom fields could be specified by calling them directly in the custom fields list instead of entering them in "Individual Text".

Anyway, thanks for a great plugin.