FileChooser Plugin for IOS platforms


I am working in a project using ionic, in which I have a button which lets the user open the file explorer of their device and pick pdf files which would be uploaded.
I have successfully implemented this feature for android using a Filechooser plugin from :
However this plugin is not working for ios platform. On searching I have found only one plugin for ios, i.e.
However, it support only ios 8 or above. Can anyone help me with this??
Is there any other plugin, or any other ways that I do not know??