Can anyone help? With out jailbreak?
Use ifile or equivalent to add files into decks folder. I just share everything on dropbox so it's easy for me to move files from my pc to ipad.
Some people are pming about this, so I thought I'd make a post for other ios users.

There are two deck folders for the app. The deck folder in the main app folder is NOT the one you put your decks in. Here's the path for the deck folder on my ipad: /private/var/mobile/Containers/Data/Application/App ID (different for everyone)/Documents/deck

The path for main app folder: private/var/mobile/Containers/Bundle/Application/App ID/Ygopro.app/media
Currently, you can update unofficially by copy pasting the scripts and cards.cdb files. This allows you to play vs AI only though. The pics and textures folders can also be copied and everything will be resized properly including anime card pics. However, do not copy the "thumbnails" folder in the pics folder as there is no thumbnails folder for ios.

I have ios 8.1.2 (latest) on ipad 2. You can jailbreak using TAIG 1.2.0. After that, you can get get ifile for free from cydia if you use the right repo source: repo.insanelyi.com

If you don't want to jailbreak, you can use ifunbox to locate the folders but it's just more difficult because their directory tree is organized differently.

1. Just copy (ctrl + c) your deck from PC
2. Open iFunbox program
3. Connect your iphone/ipad
4. In iFunbox seach for File Browser Tab and look for "user applications"
5. Search Ygopro > Documents > Deck
6. In right window, right click and hit paste (ctrl + v)
7. HURRAH!!!!!
If you have a jailbroken device, you can also use ifunbox to see the hidden folders in the ygopro.app folder that you couldn't see unless you had ifile. These hidden folders allow you to modify the pics, textures, sound, etc. Though, the music still doesn't work. The other program I use now instead of ifunbox is itools. It's a stand-alone program that doesn't require installation. You can do everything that ifunbox can do plus some more.