GitHub user breautek added a comment to the discussion: How do I open a saved 
PDF file on my Android device ?

Kind of outside my expertise so I can't really explain how very well.

But the `dataDirectory` is app-private. It doesn't mean you can't share the 
files but other apps can't just read it. There's probably an android intent 
(which you'll need to find a plugin that exposes an API to use) for sharing 
files. This is typical for apps that want to have a share button to bring up 
some UI to let the user select which app they want to share the file with (e.g. 
email client, the clipboard, facebook, so on....)

The external storage partition apps also has slightly more flexibility, where 
you could store the file inside `Documents` folder but the file plugin cannot 
write to this directory. Modern Android (API 29+) limits the ability for the 
File APIs to read/write documents onto the external storage. Instead you must 
use a Media Store API, which there are also third-party plugins for. Once 
written to external storage, other apps can use file picking APIs where the 
user should be able to see and select a file to be opened in another app). 
Depending on your use case, this might be fine.

If you can't find a plugin that exposes file sharing and want to tackle it 
yourself by creating your own plugin, then 
https://developer.android.com/training/secure-file-sharing will probably be a 
start to understand the android API and 
https://cordova.apache.org/docs/en/12.x/guide/hybrid/plugins/index.html for 
creating a cordova plugin.

GitHub link: 
https://github.com/apache/cordova/discussions/510#discussioncomment-11338237

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