Using Apple Photos extension

[Norway16]

I organize my photos in Apple Photos and have found that there is an extension available under Edit-Edit in Affinity Photo. It opens the photo in Affinity Photo 2 and seemingly allows to use all features in the app. That is great. However, when saving back to Apple Photos, there is a message stating "Editing complete (16MB change limit exceeded - document will be flattened) - press Save to keep these changes". 

1) What does the message mean - will the photo be limited to 16MB? This message is not shown when using other extensions like Pixelmator Pro.

2) What file format is Affinity Photo using for this round-trip?

3) Is there any sidecar file stored somewhere taking up additional space?

 

Thanks in advance - I have tried to search but have not found an answer to how the extension is dealing with files and formats.

[DWright]

Can you please confirm if the source image from Apple Photos is a RAW file or standard image file format.

[Norway16]

Yes, it is a RAW file (Sony ARW).

[Norway16]

Would really appreciate some more clarity on this topic. Thanks in advance.

[Revanian]

I'd like to know too.

+1

[mgamga]

any news on this?