Android programatically stored image has invalid format on PC

I'm trying to take a picture and save it following Android Documentation.

The main difference is that my code is extending Fragment, not Activity. And the fact that I'm storing pictures on the private app folder instead of the public external storage.

My Code:

private void dispatchTakePictureIntent() {
    PackageManager packageManager = getActivity().getPackageManager();
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(packageManager) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            Log.d(TAG, "Error occurred while creating the File:"+ex.toString());
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(getActivity(),
                    "com.eric.nativetoolkit.fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }
}

private File createImageFile() throws IOException
{
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getActivity().getExternalFilesDir(Environment.DIRECTORY_PICTURES);

    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpeg",         /* suffix */
            storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    currentPhotoPath = image.getAbsolutePath();
    return image;
}

This is basically cause every time I try to save pictures on the external Storage, AndroidStudio logcat shows the error "Error occurred while creating the File" due to permisions, I've the following permisions in my AndroidManifest.xml, and I also have a method to request it, but nothing works.

AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.eric.nativetoolkit">
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        android:maxSdkVersion="18" />
    <application
        android:allowBackup="true"
        android:supportsRtl="true">
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.eric.nativetoolkit.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>
    </application>
</manifest>

file_paths.xml:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-files-path name="my_images" path="." />
</paths>

But the main problem is that even correctly storing pictures inside my package/files/Pictures directory, when I try to see the image plugging my device onto the computer and navigating to the folder, it shows the message (in spanish) "Can't open file":

What I can not understand is why in my device I can correctly visualize the image. I've tried changing format (JPG, JPEG, PNG...) but no diference.

> Checking if that FLAG_GRANT works. But why I need that flag only for external? And where is the relation with the fact that I can not visualize my pictures on Desktop?

You are launching a third-party camera app via ACTION_IMAGE_CAPTURE. It has no rights to write to the location specified by your FileProvider-supplied Uri. Adding FLAG_GRANT_WRITE_URI_PERMISSION tells Android that your app wishes to give write access to that location to the camera app.

Without that permission, the camera app will fail with some sort of error. You will still have a file, since you are using File.createTempFile() to create an unnecessary empty file before you try ACTION_IMAGE_CAPTURE. If you look at the file size via your desktop file manager, you should see that it is 0 bytes. A 0-byte file is not a valid image, which is why the desktop cannot display it.