Upload PDF files adroid/ios

I’m in a process of migrating an old ionic1 app to ionic 3 and i’m struggling with the part where i select PDF files as a part of a form. In v1 i used the lfNgMdFileInput angular module for a nice file upload button interface, but i can’t find anything similar.

I’ve spent quite some time trying to find a working example of a similar file picker for both platforms (on ios it was previously limited to select a file from google drive only, but that’s fine), can anybody point me to a direction how to create this functionality in ionic 3?