1. send your rootsmagic file to people using either email or one of the free send large files websites.
Apple Mail drop, Firefox send, wetransfer, pccloud. Google these to learn more.
2. they can connect their ios device to their computer and access the file through itunes. Even a crippled windows pc should handle this.
Click the phone/pad icon->summary item->file sharing->rootsmagic app.
3. If you have these files on ancestry you could share them and they could perhaps see them with ancestry's free ios app.