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I have an Echo Show and got one for my elderly mother. I have it configured so that I can do a drop in video call into my MOM's Echo Show (thanks for explaining!). My sister does not have an Echo Show but has the Alexa app on her iPhone. I understand that she can make a video call using the Alexa app to my mom's Echo Show, but can my sister "drop in" using JUST the Alexa app? Or does my sister need a Show for drop-in capabilities?