[Zubersoft]

With iOS, the file restrictions make it impossible for apps to access files outside of their application folder. Temporary access is granted if a file is picked using Apple's file picker, but access cannot be persisted to a folder. That is why there is no option to manage your own files or to change the storage location on iOS - the operating system makes that impossible.

You will have to manually copy files and then import them from the sounds of it. I'm assuming you don't want to use the cloud, but that's normally the easiest solution to synchronize between Android and iOS.

Mike