I have tried just about every source available, from iCloud, G drive, local storage, and even an external USB. Previously, I had no issues working on something in Procreate, and simply by using the share sheet bringing it over to Affinity. In fact, the options for affinity in the iOS share sheet have completely disappeared. I have tried dragging and dropping. I’ve tried downloading files directly 3rd party sites. I have thoroughly went through the settings on every app, I’ve double checked to make sure everything is using the same color profile. They are just completely unable to open up a .psd. As a test to see if it was something happening in one direction, I created a new document in Affinity, and drag/dropped it into Procreate; while it opened, it flattened all the layers. It as if this feature just up and vanished.
If it would be helpful, I could provide a screen recording.