A short shelf of answers, and a person at the end of an email.
The file is on your laptop, in an email, or on a web page — here is each way onto the phone, and what the app can read today.
Where a score comes from in the first place: what MusicXML is, where to find it, and why we cannot host copyrighted music ourselves.
What we store, what we do not, and where the Library's scores come from.
support@omnipiano.app — questions, things that went wrong, scores that would not import.
It helps to say which device and which iOS version you are on, and what the app said. A photo of the screen is plenty. The app is young and in testing; a report that names what you were doing when it happened is worth a great deal to us.