Snapshare — http://forum.xda-developers.com/xposed/modules/mod-snapshare-share-images-videos-t2815786

This Xposed module lets you share any image and portrait video via Snapchat, not only pictures you take with the camera from within Snapchat. When you are viewing an image and click on share, Snapshare will pop up as an option. It will load Snapchat and lets you even paint on the image as if you had just taken it with your camera inside Snapchat. Snapshare will crop your images so they fit into your display.

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