This also worked for me.
- Take photo in powerapps and save it to said SP list.
- Retrieve the attachment using First(ThisItem.Attachments).Value - image inside a gallery.
Worked in iOS for me.
1. i made a attachment control and put a image
2. made a gallery with image and put a url(which is in my sharepoint)
3. it looks good on my pc but cant see it in mobile
i saw same issues in 2018
is it still not fixed?