None of the text like song title, composers fields, tempo field or bottom text (generally copyright info) seems to be saved into the MusicXML format.
During import however similar text fields are beïng imported except the song title.

The most ennoyïng missing function imho is the song title export (and import) function. This means that any file need to be manually updated after importing MusicXML into another app.

Yes, good work. This is something we've reported and you are correct, it is important.