Select "New Review" from "Google My Business" as the Trigger
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Click "Continue"
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Click "Continue"
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Click "Test trigger"
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Click "Continue"
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Click "Only proceed when a condition is met"
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Click "Choose field…"
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Click "1. Number Rating"
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Click here.
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Click "Choose condition…"
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Click "(Text) Exactly matches"
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Click here.
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Click here.
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Click "Continue"
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Select "Facebook Pages" as the next Action Step
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Click "Uploads a photo to your Facebook Page and posts it to the stream."
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Select your Google My Business Account
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For the photo, the easiest way to do this is to host a picture on your website in the file/media section. Once you do, you can take that URL and paste it into the Photo field.
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Include the description you would like to have. I have included one for you.