In the web photo annotator, click on a shape to add it. You can drag the handles to resize:

On the mobile app, when you enter the photo annotator it is ready to add an arrow. Just drag your finger where you want the arrow to be, from start-to-end:

In the web photo annotator, click on a shape to add it. You can drag the handles to resize:
On the mobile app, when you enter the photo annotator it is ready to add an arrow. Just drag your finger where you want the arrow to be, from start-to-end: