virtualbox.org

I started a new VDI image for a Ubuntu 20.04 on a Windows 10 host but I think I left the 10GB diskspace as default.
Now I'm running out of space - how do I increase the size to say, without any limit - flexible ?
I don't see any option to edit the 10GB : https://imgur.com/a/PYCY7ye

Ok, so I went to tools and changed to 200GB but on re-launching the Ubuntu OS, it shows "Low diskspace on filesystem root" 143.7MB space remaining.
https://imgur.com/a/ij7305U

See File|Virtual Media Manager.

Under File checkout Virtual Media Manager.

That worked for me!