Initsogar/cordova-webintent — pull request #24 by ZacharyYGateley (2014-06-06 17:21:54+00:00)
Title: EXTRA_STREAM and Uri

I have found: When attempting to share an image from the camera or gallery, the content is stored in EXTRA_STREAM. The Intent method getStringExtra() doesn't seem to work with EXTRA_STREAM when the content is an Uri. Instead, getParcelableExtra() should be invoked.

razwasserstein had the same issue, which the diff fixed for him:
https://github.com/Initsogar/cordova-webintent/issues/9