To do a Menu Capture:

1. Click on Menu icon in the toolbar.
2. By default, Finder becomes the active application.
3. Select the Finder menu that you want to capture. Or you can also select another application and select a menu to capture.
4. Press the Cmd+Shift+M keys to highlight the selected menu.
5. Press the Return key or click on the menu to capture it.
6. The Voila window is put up with the captured image in the Workbench

By default when the user clicks the + button after selecting a screen, the screens will be stitched.

If the user does not want to stitch the screens, he would have to capture them separately.

1. Click on Fullscreen in the Voila toolbar.
2. Select a screen to capture.
3. Click on the + button in the capture toolbar.
4. Select another screen.
5. On clicking the Capture button, the two screens will be stitched together.

Yes, to copy and paste annotations across images, perform the steps provided below:

1. Select the annotation that you want to copy.
2. Press Cmd + C or select copy from the Edit menu.
3. Switch to another image by clicking on the thumbnail in the capture tray.
4. Click on the workbench.
5. Press Cmd + V or Select paste from the Edit menu.

You can also copy and paste multiple annotations in the same manner.