Camera image captured does not save in iPhone picture library

Just for the record, I’ve done numerous Google searches, read through many posts, watched several videos and I haven’t found an answer to my question. Is it out there? Maybe, but it wasn’t for lack of trying that I could find anything.

Question: I have my app on Google Play and Apple Store. The app uses the camera picture capture function and displays this picture in an image box on the screen. Then the user pushes a button and the photo gets sent to the cloud. The picture captured is saved to Android picture libraries but the image does NOT save to an iPhone picture gallery. I know App Inventor has a storage to your device method but I can’t see where ThunkableX does this. How do I get images taken with the in-app camera to automatically be saved to an iPhone’s picture galley.