I am using LrM v.20.2 on Android 6.0.1 on a Galaxy S6. Before I could chose where I wanted my photos to be shared. Now If I select one app it just goes to that app on the next share, no choice. It is just a question with LrM, tried with other apps and I always can chose. For example, I chose to share a photo on 500px, next time I have to clear defaults of 500px so I an chose what app to share the next photo with.