info.plist - Associate mp3 file to iOS app using Swift -

i want open mp3 file in app. know common utis referenced here https://developer.apple.com/library/content/documentation/miscellaneous/reference/utiref/articles/system-declareduniformtypeidentifiers.html#//apple_ref/doc/uid/tp40009259-sw1

and know how add custom document types , added own. when use public.audio document type, doesn't work.

my info.plist:

<key>cfbundledocumenttypes</key> <array>     <dict>         <key>cfbundletypeiconfile</key>         <string>beer-mug.png</string>         <key>cfbundletypeextensions</key>         <array>             <string></string>         </array>         <key>lsitemcontenttypes</key>         <array>             <string>public.mp3</string>         </array>         <key>cfbundletypename</key>         <string>public.audio</string>         <key>lshandlerrank</key>         <string>owner</string>     </dict>