Scenario: Create a G3 character using PSD template in Affinity, then import it into CA4 in Composer mode. All is well. Then go into Content manager to pick one of the available G3 mouths. Go back to timeline and add speech file (or TTS) to the character. Try it: all is well, the mouth is moving, as intended. Go back to edit the character in PSD editor, make a couple of minor changes (you really don't have to, it's just so you can update it back in CA4) and hit Save. Go back to CA, play the clip - all mouth sprites, except the main one, are gone.