Pictures and videos are great for sharing your travels and activities but they only capture snippets of time and don’t really tell the whole story. An increasing number of storytelling apps, however, can help thoroughly document, preserve, and share just about any event. Here are three of the best: Steller lets you upload photos and videos and type in text to create a mobile storybook experience – and can all be done on an iPhone. You can edit your stories before publishing them and then share on social networks like Facebook and Twitter. Readers flip through photos, videos, and text pages as if reading an e-book. The app is free…