Field for Firebase storage folder cannot be set

I believe there is some kind or bug with the Firebase Upload plugin. When I try to establish the Firebase storage folder I am not able to do so because the entered text gets automatically erased. The plugin itself is working. The image is uploading but to the root of the storage.

I have also noticed that the plugin just accepts image files. I am going to try to make it accepts pdf or some other kind of documents.

Thanks!