On the Photoshop on iPhone homescreen, select Create new > Add from Photos.
Select Select area > Tap select .
Select Apply as mask from the toolbar that opens after committing the change to isolate the selection and change the background.
Select Add image to work with any of these options for adding a new image:
- Add from Photos: Add an image from your camera roll.
- Add from Adobe Stock: Add free content from Adobe Stock.
- Generate image: Generate a new image using text prompts.
- Take a photo: Capture a new photo.
- Add from Lightroom: Add an image from your Lightroom catalog.
- Add from Files: Add an image from your device files.
Within Layer properties, select Transform to modify the background with your photo or Blend and opacity to adjust the opacity of the layers.
In the Layers panel, touch and hold this new layer, then drag it below the masked layer to set it as a background.
Long-press and drag in the compact Layers panel to reorder the layers in the layer stack.