@lamchowdong Welcome to the Serif Affinity forums. iOS 12 is still in developer beta, looking for regressions like this one. Our plan is that if Apple have not addressed this issue when iOS 12 is in public beta, then we will need to rewrite the code that worked for iOS 11 and will then push an update, therefore resolving the issue before the full public release. To be honest, this is Affinity Photo code that we think should work and the new implementation of Metal has stopped it workin