Ошибка "IOException: Permission denied" при работе с камерой на Android Webview

Столкнулся с проблемой с запуском камеры в Webview-приложении на Android.

На странице есть input type="file" с атрибутами: capture="camera" accept="image/*"

При работе через браузер - все ок. Однако в Webview, естественно, это не работает. Использовал клиент webChrhome. При клике на поле ввода открывается проводник файлов без предложения выбора камеры. В логах вижу ошибку, но в manifest указано все, что требуется.

E/Webview: Image file creation failed java.io.IOException: Permission denied
    at java.io.UnixFileSystem.createFileExclusively0(Native Method)
    at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:281)
    at java.io.File.createTempFile(File.java:2001)
    at com.payou.app.MainActivity.createImageFile(MainActivity.java:178)
    at com.payou.app.MainActivity.access$200(MainActivity.java:28)
    at com.payou.app.MainActivity$2.onShowFileChooser(MainActivity.java:84)
    at Ii4.e(chromium-Monochrome.aab-stable-561513523:31)
    at Hs.runFileChooser(chromium-Monochrome.aab-stable-561513523:28)
    at android.os.MessageQueue.nativePollOnce(Native Method)
    at android.os.MessageQueue.next(MessageQueue.java:379)
    at android.os.Looper.loop(Looper.java:144)
    at android.app.ActivityThread.main(ActivityThread.java:7529)

Ниже привожу часть manifest и код моей Activiy. Подскажите, в чем может быть еще проблема? Или чего-то не хватает?

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.CAMERA2" />

            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
                if (mUMA != null) {
                    mUMA.onReceiveValue(null);
                }
                mUMA = filePathCallback;
                Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (takePictureIntent.resolveActivity(MainActivity.this.getPackageManager()) != null) {
                    File photoFile = null;
                    try {
                        photoFile = createImageFile();
                        takePictureIntent.putExtra("PhotoPath", mCM);
                    } catch (IOException ex) {
                        Log.e("Webview", "Image file creation failed", ex);
                    }
                    if (photoFile != null) {
                        mCM = "file:" + photoFile.getAbsolutePath();
                        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
                    } else {
                        takePictureIntent = null;
                    }
                }

                Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
                contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
                contentSelectionIntent.setType("*/*");
                Intent[] intentArray;
                if (takePictureIntent != null) {
                    intentArray = new Intent[]{takePictureIntent};
                } else {
                    intentArray = new Intent[0];
                }

                Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
                chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
                chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
                startActivityForResult(chooserIntent, FCR);
                return true;
            }

public void openFileChooser(ValueCallback<Uri> uploadMsg) {
        this.openFileChooser(uploadMsg, "*/*");
    }

    public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
        this.openFileChooser(uploadMsg, acceptType, null);
    }

    public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("*/*");
        MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        if (Build.VERSION.SDK_INT >= 21) {
            Uri[] results = null;
            //Check if response is positive
            if (resultCode == Activity.RESULT_OK) {
                if (requestCode == FCR) {
                    if (null == mUMA) {
                        return;
                    }
                    if (intent == null) {
                        //Capture Photo if no image available
                        if (mCM != null) {
                            results = new Uri[]{Uri.parse(mCM)};
                        }
                    } else {
                        String dataString = intent.getDataString();
                        if (dataString != null) {
                            results = new Uri[]{Uri.parse(dataString)};
                        }
                    }
                }
            }
            mUMA.onReceiveValue(results);
            mUMA = null;
        } else {
            if (requestCode == FCR) {
                if (null == mUM) return;
                Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();
                mUM.onReceiveValue(result);
                mUM = null;
            }
        }
    }

    // Create an image file
    private File createImageFile() throws IOException {
        @SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "img_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        return File.createTempFile(imageFileName, ".jpg", storageDir);


    }