Did you ever get an answer on this?  Also, other user mentioned where the files were supposed to be saved on a windows box, where do they get saved on a Mac?

I'm having this issue too, can't wait to try out the fix. 

Since you are using Affinity like I am, which I love. 
My question is .......
So when I'm creating artwork for cartoon animator 4 using Affinity it obviously saves it as an affinity file unless I export it to PSD. 
Does that mean there is now two file types of my art work now?
I'm confused about how this works. 
Do I just continue working  the PSD file going forward ignoring the affinity file?
Is it exactly the same thing using a PSD file in Affinity as it is using an exported PSD file?
Know what I mean? When I export as PSD I end up with two files, the original and the PSD!!!
I'm a little confused. 



Cartoon Animator 4 - Affinity Photo & Design
macOS Catalina 10.15.4
iMac (Retina 5K, 27-inch, 2017)
4.2 GHz Quad-Core Intel Core i7
32 GB 2400 MHz DDR4
Radeon Pro 580 8 GB

Ah, yes, thank you... that was the fix. I did have to make sure the PSD was save to the correct folder (below), but once I got that it worked perfectly. Now I'm really tickled because I like Affinity Photo a lot - it's so much easier to use (for me), and the price is right.

C:\Users\Owner\AppData\Local\Temp\CTA4Temp

Will CTA4 sync-up with Affinity Photo or am I missing something? Mine doesn't sync up when I save the PSD in Affinity Photo (both have latest version and updates).

I launch Photo from CTA4, but when I save the PSD it doesn't update CTA4. I see there's a temp folder it appears to use, and I saved there, but I wondered if I'm missing something. It worked for me from Photoshop, but not working with Photo. I don't have license for Photoshop anymore, so I switched.