When you first use the WordPress for iOS app and try to add a photo you'll see this prompt:
If you tap "Don't Allow" though it prevents the app from accessing your photos in the future. If you accidentally did that and are not able to upload photos in the WordPress for iOS app you might see this error displayed:
To fix that, follow these steps:
- Open the Settings app on your iPhone.
- Tap "Privacy"
- Tap "Photos"
- Find the "WordPress" app
- Slide the toggle next to "WordPress" to on
Now when you next go to add an image to a post or page you'll have access to the photos on your device.