Can't import demo media with WordPress importer

I have followed these instructions to import the demo content -

  1. Import regular Shapely demo content by going to WordPress dashboard → Tools → Import → WordPress. You should there upload file shapely-demo.xml

Posts & pages imported but for all media items it said - Failed to import Media
I have tried uploading using the TwentyTwenty theme & have tried uploading with & without attachments with no success.

How can I import the media files? Would a different plugin work better?

Hey there

Sorry about that, may I take a closer look? please send me your admin details in a private message and I will verify,
Make sure you are using the latest version of the theme and WordPress, also, please consider full demo import only will work on blank WordPress installation