As xeeynamo said, this app is the "emulated" steam version. After jailbreaking the device, I found the "ff7 1.02" folder inside the app's folder using ifunbox, which had all the contents from pc version. I imported the files from the mod(char.lgp and flevel.lgp, yes, these replaced the original files as well).
Started the game and the mod worked just like playing it on pc, albeit the bad framerate (I guess ios doesn't support opengl so well). Tested on my jailbroken ipad air 2, so i think your iphone 6 should get the same result

Btw, English isn't my native language so please pardon me if you find it bad

Screenshots coming soon...