There is a bug fix available:
https://help.nextcloud.com/t/after-updating-to-nc16-0-2-i-can-not-upload-via-web-ui-by-d-d/56190/1
To make it work you have to log out and log in again.
There is a bug fix available:
https://help.nextcloud.com/t/after-updating-to-nc16-0-2-i-can-not-upload-via-web-ui-by-d-d/56190/1
To make it work you have to log out and log in again.