Possible bug with .mdl upload in Personal Image Classifier?

Hi there! I am prepping a lesson involving the Personal Image Classifier, and want students to be able to test each other's models virtually.

When I try to upload an mdl file to this webpage on the latest version of Google Chrome, the button stays outlined but absolutely nothing happens.

It works to upload training data, but not a previous mdl file itself. I made the mdl file directly in the Personal Image Classifier.

Help would be appreciated, screenshot below!