If you are running iOS 11 or above on your iPhone, your photos may be saving as HEIC files. However, this format isn't compatible with all other services just yet.
For example, if you are using the Automatically back up your new iOS photos to Google Drive Applet, it will fail if your images are in HEIC format. You will need to switch to saving images as JPEGs for the Applet to work again. Here's a useful article that can walk you through the process of how to make this change so that you can continue using iOS Photos Applets without problems.