Describe the bug
When uploading a file to a files section, a modal window pops up showing an "Ok" button – but clicking "Ok" doesn't do anything.

To Reproduce
Steps to reproduce the behavior:

1. Go to a files section
2. Upload a file
3. Click on "Ok"

Expected behavior
I would expect the modal to disappear when clicking "Ok", performing the upload in the background while I continue my work. If this is not possible, I would expect "Cancel" to be the only available option (and omitting the "Ok" button).

Screenshots

Kirby Version
3.3.0

Console output
–

Desktop (please complete the following information):

• OS: macOS Catalina
• Browser: Firefox
• Version: 70.0.1