In version 31.0.5, when uploading documents via file request links, it required adding the uploader’s information, and based on that, a corresponding folder would be created to store the files. However, in version 31.0.6, it seems that the dialog for adding uploader’s information cannot be triggered, which causes an upload error:
“Unknown error during upload && Error during upload: Nickname is required for file requests.”
I just tried on my 31.0.7, a new folder and I shared it with a public link. I chose the option file request.
On a different browser in a private connection, I can upload files using this link.
You didn’t use the “internal link” by accident? Or shared as well via federated cloud and used this share? Or the folder is already shared to you and re-sharing is restricted?
Also try 31.0.7 first, perhaps they already fixed it.