Hey there Peyman_a71,
Thanks for reaching out in Apple Support Communities. I understand you have some questions about using Files across your devices. I’ll be happy to help with this.
Files is meant to make it easy to access all your content across your devices. With Files, you can use services like iCloud Drive, Box, Dropbox, and more to access the same content on your iOS device, Mac, or PC.
For instance, if you add a file or folder to iCloud Drive in the Files app, you should be able to access that file or folder on your Mac which iCloud Drive, or even your PC using iCloud for Windows. The same applies if you use services like Dropbox or Box.
Take a look at the following article for more info on using Files and pay special attention to the info under ‘Look for files on other devices’:
Use the Files app on your iPhone, iPad, or iPod touch
You can read how to set up iCloud Drive on your Mac and PC here:
Set up iCloud Drive
If you haven’t already, learn how to download iCloud for Windows here:
Download iCloud for Windows
Cheers