There is a lot to like about Affinity Photo.
While putting it to first professional use, I have been bitten by something that made me abandon the software for now.
I am using Capture One as my Raw and DAM front-end. Going to and from AP works very well. I use the TIFF file fomat to do so.
Yesterday I hade been editing for a few hours on an image with many layers (multiple exposures, lightpainted details etc). Everything went smoothly. I saved a few times and both in AP as in C1 no problem. Up untill the last layer I added. I saved the image, the export progress bar came up as before. However in C1, the warning "unreadable or damaged file" came up. I went back to AP and the file was not readable as well, complaining about corruption.
My guess is that the file stack exceeded 4GB and that caused the corruption. However, there was no warning of any kind. I looked at the TIFF file in explorer and it had about the same size as the original TIFF without all the layers.
I do not have versioned back-up software running in the background. Normally there is no need and I never lost a complete image stack before.
Aside from the erroneous behaviour in corrupting the file, it would be nice if AP kept an internal recovery file for situations like this.
Hope this is in the roadmap?!