Sorry, Marc, I am missing something that is likely very obvious.
I can only find one location on my server with Invision files on it via FTP
However, I do see, for example, ACP > Files > Storage Settings looks like a different path.
Somehow my knowledge must have regressed, and I'm lost here. The path showing in ACP > Files > Storage does not exist in my FTP program.
How is my site even functioning? Clearly I'm missing some basic stuff here... Apologies.