How to find the application responsible for a Share menu item?
Sharedr (Google Play), a replacement share dialog app, can display this information:

Install Sharedr.
Launch the Share action.
Choose &quot;Sharedr&quot; instead of default Android share (you can choose &quot;Just once&quot; if you don't want to keep using Sharedr).
In the action list, long press an item and choose &quot;App Info&quot;. It will take you to the responsible application's settings.

P.S. Fake &quot;Copy&quot; menu item is AfterShip.