Not Enough Free Space help

Hello, can someone please help me figure this out.
I am running Nextcloud in VirtualBox. When trying to upload file I get “Not enough free space”.
From what I can see I am only using 20GB out of 50GB in the virtualbox drive.
The file I am trying to upload is GB.
I see that a lot of people use a specific format with info about their system when posting. Is there an instruction post I can follow to properly ask for help?
Thanks.