Transferring pdf and Word files from Windows to iPhone

It is also possible to

• Upload files to iCloud Drive using the iCloud Web interface (https:/www.icloud.com/)
• Upload files to Google Drive (if you have the Google Drive app on your iPhone)
• Upload files to Microsoft OneDrive (if you have the Microsoft OneDrive app on your iPhone)

When you install the Google Drive and/or Microsoft OneDrive apps, you can access Google and Microsoft cloud storage from the Files app, in much the same way that you access iCloud Drive.

The easiest way is to email them to yourself.

Or maybe the easiest way is to install iCloud for Windows on your PC, then drag them onto that app.