Cannot use Multi-file upload on Microsoft Edge.

Steps:

1. Log in to admin panel using Edge as browser.
2. Go to Content / Content structure.
3. Enter a container item e.g. folder.
4. Try using Multi-file upload by clicking on the Upload sub-items button and selecting files via Upload sub-items from the pop-up.
5. Try using Multi-file upload by clicking on the Upload sub-items button and using drag & drop onto the pop-up.
6. Try using Multi-file upload by using drag & drop onto the Sub-items list.

Actual: Nothing happens in UI, in console error occurs: "SCRIPT5002: Function expected".
Expected: Files are uploaded without errors.