My iPhone won't allow my social media to post pictures

When I go on Instagram it says, "Please allow acces to your photos. This allows Instagram to save photos to your camera roll." It takes me to settings but it does not show anything for me to acces my photos.

I then went to Privacy-> Photos. It said "Photos stored on your iPhone may contain other information, such as when and where the photo was taken. Apps that have requested access to your photos will appear here." I've waited for minutes but no apps appeared!

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