Default Share pictures from gallery

Why is the share option on a picture in the gallery greyed out?

Sent from my SM-C101 using XDA Free mobile app
Neil.

Device: Samsung Galaxy S4 Zoom SM-C101 Android Version: 4.2.2 Baseband: C101XXUAMK4
Device: Samsung Galaxy Gear SM-V700 Android Version: 4.2.2 Baseband: V700XXUBNC1
Device: Samsung Galaxy Note GT-N7000 Android Version: 4.1.2 ROM: 4.1.2 stock rooted Baseband: N7000XXLT3
Device: Nexus 7 32Gb Android Version: 4.4.2 Build: KOT49H