With beta 3, some apps no longer have permissions to write to internal storage, and there are no permissions settings to change for the app, e.g. Image2Wallpaper.
Please try clearing the system cache and rebooting your device.
If issue persists, please send us an error report with screenshots from One UI Beta App (Beta Feedback -> Send feedback-> Error Reports -> "Select Category" -> Input frequency and Description" -> Send (Top Right Icon). We appreciate your help for supporting beta program.
