Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
My guess would be that you are limited by "restricted mode". But I am not entirely sure. Try running the # plesk bin poweruser --off -simple false -lock false command trough SSH to disable restricted mode.