backup and restoral not copying playlist correctly?

[Niki]

On my iPad (IOS 11.0.1, iRealPro 8.0.2) I create a new song, add it to an existing playlist.
Then I make a backup, taking all defaults, and email it to myself.

On my iPhone (IOS 11.0, iRealPro 8.0.2) I get the email, touch & hold the attachment, choose iRealPro.
An import seems to happen.
The new song gets imported, but the existing playlist is not updated with the song.

Thanks for any advice....Lyle

If I understand it correctly, you're not using sync, just transferring a playlist from iPad to iPhone.
In case you import a playlist to the other device, it won't overwrite the existing one but it will import the playlist.
Did the playlist import?
Please email us directly, it's easier to exchange messages there.
Thank you!

P.S.: You can try Bob's suggestion, iCloud Sync.