Will File Browser allow me to see an application's folders inside a Docker container?

[TruthTriumphs]

I have a Linode virtual server running Ubuntu linux. It hosts on my domain the Mastadon social media app. I first installed Cloudron as an admin tool to use to automate the installation of Mastadon. So Mastadon is now installed in a Dockerized container on my Linode volume.
I can see my volume files in SFTP but can not access or see the literal folder & file system paths of the Mastadon app that is running.
Even when using linux or docker commands.

I want to change images and have access to the page template files in Mastadon.

Can I install filebrowser on my server and have access to the Mastadon application files?
If so, what pathway should I be looking for to use to access the Mastadon file structure?

Or should I simply install it at the /root or at the /home of my Linode volume?
I've asked a couple of times for help from the Mastadon discussion group but have been ignored, which is why I kept searching and found your application.

Thank you for some help!