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In your moderation bin (under the Inbox tab) you can review incoming photos, and decide whether or not to accept them. Note that photos only come into your inbox if you have selected ‘requires approval’ when you set up your content board, or if you have chosen to collect photos automatically from Flickr or Instagram. The inbox allows you to filter incoming content by type.
To approve or reject an incoming photo, click the Review button on the right-hand side. This will pop up the moderation dialog, where you can choose to aprove, reject, or decide later.