Missing a path for the inbox

You can place the block ONLY on /private-messages and /private-messages/{private_message_thread} page and you have the inbox. On mobile you might need some JS tweaks to collapse the inbox when you select a thread so that the thread shows on the screen.

I think this module needs a big update of its interface for it to be widely adopted.

Here are some projects based on the module, the interface is perfect on desktop as well as mobile :

https://github.com/jez500/Private-Message-Messenger

https://communitytalks.getopensocial.com/manual-features-and-site-settin...

It is necessary that when installing the software it is already ready to be used, at least with an interface adapted to Olivero