Insert Multiple from Camera Roll

Working on a Go app for a customer, and building in a photo feature. Client would like the ability to select multiple photos in the Camera Roll and import them as one step - something like importing a folder of images in desktop FMPro. 

From what I've seen so far, it doesn't look possible - Import script step doesn't work for picture/movie files on iOS, and Insert From Device (Photo Library) only allows selecting one photo. 

Is anyone else aware of a way of making this work?