Hello @MariaJ12 ,
From my understanding for the mobile app, you should be able to go to your iPhone's Settings > Privacy > Photos. Once there, you should be able to scroll down to the Constant Contact app, and switch the permissions between None, Selected, and All.
If this is in regards to a Mac desktop/laptop then I'd recommend reaching out to Apple support to see if they can provide insight on changing app permissions or accessibility.
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