As a publisher, you can decide whether to showcase your content via a full feed (ie. full text and multimedia content can be read through a reader app) or a partial feed (ie. only showing limited text, inviting readers to browse your full-content directly on your website).
The choice is entirely in your hands, and generally made depending on your goal as a publisher. In most cases, publishers looking to make their content available to the largest audience possible will decide to showcase a full-feed, whereas those who want to bring people to their site or blog will use a partial feed.
In both cases, your feed can be optimized to provide the best reading experience in feedly (See our tips for full-feeds and partial feeds).