To upload from a share link you first need to share or create a link. Here you can see I have create a sub folder under the Approval folder. Select the Upload from production folder and go to the sharing menu.
You share as you normally would do but enable the “Allow Direct Upload” and then press the "send" button.
Then on the share link you can see there is now a upload buttom.
Now it is just to drag your files into the upload window.
If the folder have been shared with other users before, then they will now get a notification E-mail that there is now files available every time new files is upload into the Upload from production folder.