I'm aware of this, currently looking for advises on what settings to change!
Have a great day, Erik
In reply to Erik P. Ernst:
The most common issue is the upload folder don’t having write permissions by ASP.NET user.
In reply to Nuno Maia:
Common error is actually timeout because the connection is too slow or the file too big. You can see that uploading a small file actually works.
If now adjusted the setup, so you should be able to upload a bigger file and not experience timeout. Before the setup was 10MB and 1 minut. Now it's 50 MB and 60 minutes. And if you have a bigger file, then contact me again.