Why can't I upload a document to my form using an iPad?

Environment:

iPad, iPhone

Oracle Human Capital Management Cloud (Oracle HCM Cloud)
Also known as Mobile Agent App / Oracle Tap

NOTE:  Oracle B2C Service Mobile Agent App (TAP) is deprecated as of May 2017

Resolution:

This functionality is currently not possible.

Cause:

Currently, it is not possible to upload a file from an iPad/iPhone using a web browser. The iOS used by an iPad (or iPhone) lacks the file handling system necessary for this functionality.