Почему приложение в Android Studio отказывается скачивать mp3 файлы из Dropbox?

2019-01-22 01:12:07.360 20293-20293/com.dropbox.core.examples.android E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.dropbox.core.examples.android, PID: 20293
    android.os.FileUriExposedException: file:///storage/emulated/0/Download/Bon%20Jovi%20-%20It's%20My%20Life%20(Acoustic%20version).mp3 exposed beyond app through Intent.getData()
        at android.os.StrictMode.onFileUriExposed(StrictMode.java:1960)
        at android.net.Uri.checkFileUriExposed(Uri.java:2362)
        at android.content.Intent.prepareToLeaveProcess(Intent.java:9881)
        at android.content.Intent.prepareToLeaveProcess(Intent.java:9835)
        at android.app.Instrumentation.execStartActivity(Instrumentation.java:1612)
        at android.app.Activity.startActivityForResult(Activity.java:4501)
        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:754)
        at android.app.Activity.startActivityForResult(Activity.java:4459)
        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:741)
        at android.app.Activity.startActivity(Activity.java:4820)
        at android.app.Activity.startActivity(Activity.java:4788)
        at com.dropbox.core.examples.android.FilesActivity.viewFileInExternalApp(FilesActivity.java:242)
        at com.dropbox.core.examples.android.FilesActivity.access$400(FilesActivity.java:40)
        at com.dropbox.core.examples.android.FilesActivity$4.onDownloadComplete(FilesActivity.java:212)
        at com.dropbox.core.examples.android.DownloadFileTask.onPostExecute(DownloadFileTask.java:45)
        at com.dropbox.core.examples.android.DownloadFileTask.onPostExecute(DownloadFileTask.java:21)
        at android.os.AsyncTask.finish(AsyncTask.java:695)
        at android.os.AsyncTask.-wrap1(Unknown Source:0)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6518)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)