I've had a look at the documentation for FileProvider, and it does provide a way to share data between apps. Maybe you could show your current code, and explain more about what's going wrong and what doesn't work?
Here's an extract from the Google docs on the subject
https://developer.android.com/reference/android/support/v4/content/FileProvider.html
Serving a Content URI to Another App
There are a variety of ways to serve the content URI for a file to a client app. One common way is for the client app to start your app by calling
startActivityResult(), which sends an
Intent to your app to start an
Activity in your app. In response, your app can immediately return a content URI to the client app or present a user interface that allows the user to pick a file. In the latter case, once the user picks the file your app can return its content URI. In both cases, your app returns the content URI in an
Intent sent via
setResult().
You can also put the content URI in a
ClipData object and then add the object to an
Intent you send to a client app. To do this, call
Intent.setClipData(). When you use this approach, you can add multiple
ClipData objects to the
Intent, each with its own content URI. When you call
Intent.setFlags() on the
Intent to set temporary access permissions, the same permissions are applied to all of the content URIs.
Note: The
Intent.setClipData() method is only available in platform version 16 (Android 4.1) and later. If you want to maintain compatibility with previous versions, you should send one content URI at a time in the
Intent. Set the action to
ACTION_SEND and put the URI in data by calling
setData().
More Information
To learn more about FileProvider, see the Android training class
Sharing Files Securely with URIs.