Possible to upload multiple files?

.. to simulate an upload dialog where a user selects multiple files.

upform = forms[0]
upform['files'].value = [open("a.gz",'rb'), open("b.gz",'rb')]

This gives me:
ValueError('Value must be a file object or file path')

Start by reproducing the issue with the shown `upform['files'].value` assignment and inspect the form-upload handling it reaches. Determine how a list of file objects is validated and define done as accepting both `a.gz` and `b.gz` in one simulated multipart upload without the current ValueError.

Written by the indexing model from the issue text.