How to access files on my iPhone 5S?

I plugged in my iPhone to my PC and made a folder on the root called "PDF" and put some PDF files in it. Now, where do I go on my iPhone to view these files? Sorry for the dumb question! Went from Android for 3 years to the iPhone and I know how basic this task is!

IPhones do not allow for this method of files transfer. You can't do anything by adding folders into the root. You need to use an app like Drop Box to access files.

WHAT THE HECK?! That's not doable as Drop Box only gives you 2.5 GB, I have about 4 GB of PDF files, and that would be past my data limits to download all those files to my iPhone (not to mention how long it would take to upload 4 GB of PDFs)

I dnt knw

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