One of the cool new features of iOS 11 is Drag & Drop which, with the release of Zunos 5.0, is available for PDF's and Office documents that are shareable from your content library.
To drag & drop content you can make use of the multitasking feature in iOS. Check out the video below which demonstrates making use of multitasking and drag & drop on iPad with Zunos.
You can use this approach to share more than one file at a time from Zunos.
Note: sharing of PDF's via Drag & Drop is only possible if the PDF is set as sharable by your Zunos administrators.