iPhone - can I save/read/edit Windows Notepad files?

I use Windows 10 Notepad .txt files a lot and I keep them on my Windows PC hard drive.

I already know that in Windows I can attach the .txt files to an AOL email, send it to my iPhone, and read the files in AOL on the iPhone.

But I can see no way of saving them on my iPhone and keeping them in a folder there, opening them and editing them. I guess there is nothing like the Windows folder system on iPhone.

Are there ways of doing this, please?

Or if I uploaded then to e.g. OneDrive, I could access them with my iPhone, but again, could I open, read and edit them?

Mike