Using IOS 11.1 and SDK 6.3.0 the document viewer for ipad no longer allows the sharing of a pdf to anything except email. There may be some undocumented permission that was introduced in IOS11 that is not in the appcelerator documents or the control's share event is broken.
Steps to recreate:
1) Install acrobat on the ipad
2) Create an app that has a pdf in the project and open it in a document viewer
3) Click on the share button on the document viewer and select acrobat. Observe nothing happens.
4) Any app or "Save to Files" from the share menu do not allow you to save or open the pdf.