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
It is known issue caused by firewall settings on Plesk server. For fixing this issue you should setup your firewal for ftp in passive mode or just disable firewall.
I have the same issue since I enabled Firewall. Though I have configured PassivePorts so my all my previous FTP connections work on PC. iPhone app is still unable to access the files.