The best app I have seen for creating digital stories with photos in the gallery and adding narration. Easier to use than Photostory on a Windows computer. Limited in sharing product.
Pictello is a simple way to create talking photo albums and talking books on your iPad, iPhone and iPod touch. Each page in a Pictello Story can contain a picture, up to five lines of text, and a recorded sound or text-to-speech using high-quality voices. Stories can be shared using iTunes File Sharing or via WiFi with other Pictello users through a free account on the Pictello Sharing Server
ThingLink's technology makes it possible to embed audio, video and rich media links directly in images and share them across the web. Encourage your fans, friends, and consumers to engage with images by watching videos, listening to songs and sound clips, and exploring social media.