When you run the settings action and then press save. You will be prompted to finish the setup in OBS with the following message:

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In OBS there will be a properties window open. Select the Clone dropdown and select the source you wish to take photos of. Then press OK
Resize and Crop the Polaroid Picture • Source source in OBS so it aligns inside of the Polaroid Picture
In the Source list, drag the Polaroid Picture • Source source into the Polaroid Picture • Group group, then press OK in Streamer.Bot