The ways to install the "Nested numbered lists for the block editor" plugin are described here.

In your WordPress backend Go to Plugins > Add plugin. Search there for "Play Audio Once". Click on "Install" for the plugin and then on "Activate. Install manually Go to the official plugin website and click on "Download". In your WordPress backend, go to Plugins > Add plugin and click on the "Add plugin" button. In the file dialog, select the file you downloaded in step 1 and upload it. Then activate the plugin. Install via FTP Go to the official plugin website and click on "Download". Then upload the ZIP file via FTP to the directory "/wp-content/plugins/". Activate the plugin via the „Plugins“ menu in WordPress.

Play audio once

WordPress plugin

free of charge

Adds an option that prevents an audio file from being played multiple times. You can set this for the entire website or restrict the audio files only for certain files that you have added in your editor.

Plugin page:

https://de.wordpress.org/plugins/play-audio-once/

Support forum: https://wordpress.org/support/plugin/play-audio-once/

GitHub repository: https://github.com/threadi/play-audio-once

Articles

Installation of „Play Audio Once“
The ways to install the „Nested numbered lists for the block editor“ plugin are described here. Read more
Installation

Play audio once

Articles

Installation of „Play Audio Once“