针对此问题，可以采取以下步骤。

1. 检查AndroidManifest.xml文件中的权限是否正确设置。确保已经启用摄像头权限（android.permission.CAMERA）和存储权限（android.permission.WRITE_EXTERNAL_STORAGE）。

2. 在运行时检查权限，通过以下代码片段来申请摄像头和写入存储的权限：

if (ContextCompat.checkSelfPermission(thisActivity,
                Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(thisActivity,
                    new String[]{Manifest.permission.CAMERA},
                    MY_PERMISSIONS_REQUEST_CAMERA);
        }

if (ContextCompat.checkSelfPermission(thisActivity,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(thisActivity,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    MY_PERMISSIONS_REQUEST_WRITE_STORAGE);
        }

3. 确保在切换前/后置摄像头时，正确地调用mCamera.stopPreview()和mCamera.startPreview() ，以确保预览同时启动。以下是切换摄像头时的示例代码：

private void switchCamera() {
        mCamera.stopPreview();
        mCamera.release();
        if (mCurrentCameraId == Camera.CameraInfo.CAMERA_FACING_BACK) {
            mCurrentCameraId = Camera.CameraInfo.CAMERA_FACING_FRONT;
        } else {
            mCurrentCameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
        }
        mCamera = getCameraInstance(mCurrentCameraId);
        setCameraDisplayOrientation();
        try {
            mCamera.setPreviewDisplay(mPreview.getHolder());
        } catch (IOException e) {
            e.printStackTrace();
        }
        mCamera.startPreview();
    }

4. 在上传图像时，确保可以访问正确的文件路径并且文件具有正确的权限。以下是上传图像的示例代码：

private void uploadImage() {
        String filePath = "/sdcard/test.jpg";
        File file = new File(filePath);
        if (file.exists()) {
            // Do upload image task here
        } else {
            Toast.makeText(this, "File not found!", Toast.LENGTH_SHORT).show();
        }
    }

通过执行以上步骤，我们可以成功地解决'Android Camera Capture - switch Font/Rear Camera Image Doesn't Upload”问题。