At the time of writing, the achievement is achievable and there are no bugs with it. All you have to do to get it is upload a video. You can do this after completing a level by pressing F5. However, many people run into a problem when the "ERROR UPLOADING" displayed on the screen when uploading a video.
In almost all cases, the cause is a firewall.

Firewall - is a kind of filter that does not allow suspicious data flow to or from the Internet. It is needed to protect against hackers and viruses. But, sometimes, it blocks traffic that is desirable for us, as in our case.

The solution is simple, you need to temporarily disable the firewall. To do this, go to the control panel, find Windows Firewall there, go to Turn Windows Firewall on and off and disable it for private and public networks. You may also need to disable the firewall built into the router. The procedure may differ depending on the manufacturer and model of the router, so I recommend reading about how to do this for your particular router in the instruction manual or on the Internet.

Done, now you can upload the video and get the desired achievement, but don't forget to re-enable the firewall after that in the Firewall settings on your computer and router.

Here you can thank the author