Unable to locate "My Files" from S3 on my PC

Hi, guys!

Could someone please help me.

I wanted to put a PDF from my PC to my S3 home screen. As it came out such a simple thing is made very hard. I tried to move the file from SDCard folder to anywhere else - didn't work. Then, I finally created a shortcut folder from Apps and linked it to the SDCard directory folder - satisfactory. Not quite what I wanted, but is better than nothing. I got the file on SDCard directory by entering S3 My Files folder on my PC, created a new folder in there and draged the PDF into the new folder.

I can download that PDF from the internet, no problem, but I can't move it out of the Dowloaded folder.

So, would you pease help me and tell me:

1. Why is it so complicated to put folders and files from PC to home screen on the phone?
2. Why can't I move downloaded files into folders I need them to be? Or, if I can - why is it made so complicated?
3. Is there a simple and easy way to do what I wanted to do? (without installing any document managing apps and stuff, because managing documents on the phone with an app - that's just stupid).

I've been a huge fan of my S3, but things like this make me want to toss it at a wall or something.

I know that with computers the problem is mostly between the chair and keyboard, am I being just downright stupid in these cases too?

Thank you!