I use the plugin to attach to the attachment page. On the test version it worked, but on the pro version it stopped. Tell me how to solve the issue. Plugin: WP Attachments
Thanks for your query.
Already we talked.
Previously you are using lite version of Books plugin where single book template was not included & single book showing based on your current theme.
At pro version, single book template included & showing meta fields data.
Your mentioned attachments coming from other plugin which is not part on Books Showcase plugin.
Already informed how to disable single book template.
Thanks / Sarwar