How hard can it be to copy a file to a Nuget Feed?

One of those days today!

My supplier has turned off their Nuget feed, so I will need to publish a back up of the files to an Artifact in Azure to use as a temporary feed.

That should be easy enough just copy the file to the feed right?

No not at all.
The feed has download options but no upload.

OK study this

I select Nuget
What a rabbit hole!

No I do not want to figure out a new path to store my nuget.exe
No I do not want to figure out the credential manager, surely it is already working since I can publish with Visual Studio

Ok so I create a new solution? , an c# framework Api
I set up a nuget package locally

Augh! Try Stack overflow.