Unable to upload files in UX Branding section

Hi All,
Today I experienced an issue with uploading files in UX->Brand section.
The button for file upload is active, but nothing happens after clicking it.
This happens while choosing custom App logo, Launch image and Background image.
Issue occurs on Windows 10 (Google Chrome) and Chromebooks.
I found the issue at about 07:30 GMT and for now (13:30 GMT) it still occurs.

I have already checked settings in terms of pop-ups and all other stuff - there is nothing blocked.

Did anyone experience the same issue and know how to solve it?
Thanks in advance.


I having the same problem where the blue button to choose a custom logo doesn’t do anything.
How do I solve it?

Thank in advance