I use both PC computer, and an iPhone 12. I want to be able to email myself a document like PDF or Word file, save it to my iPhone, then be able to find and read it when I need to just like an iPhone version of MS Explorer.
What I’m trying to do is find a File Manager for my iPhone which don’t need any integration with the Cloud.
I have tried using Adobe Acrobat Reader and My File Manager, but neither one seems to find the files I previously saved from email to my iPhone.
Documents by Readdle could be what you need. Free version but you get the odd ad or two. I am presuming you will be reading this on your iPhone.
If you want to view documents on iPhone from your PC then look at iMazing.