Ubuntu Server - Allowing user to upload and download across the entire filesystem - sFTP

I'm a Linux newbie. I'm playing around with Ubuntu Server 22 I've got a standard image spun up using AWS. I'm using MobaXTerm as my SSH client it has the facility to upload and create folders/files in the panel built into the application I believe through SFTP. I'm logging into the server with SSH with a secure key file as the ubuntu user. I'm only able to add/edit/delete files with this panel in the directory /home/ubuntu/ It's only me using this server and I'm wanting to add/edit and remove files quickly without using vim and other tools, it would be great to be able to use this facility across the entire filesystem but I'm getting the error permissions denied outside of the /home/ubuntu/ directory. How might I resolve this to allow the user `ubuntu' to add/remove files anywhere on the filesystem using this inbuilt facility in MobaXTerm which I think is using sFTP. I accept this is not the safest practice.