akg10tb

Well now...... I've just completely uninstalled Affinity (using 'Clean my Mac') and re–downloaded it from the App Store whereupon – hey presto! – the "Edit in Affinity" extension is now working! So, all good now – I can at last round–trip to Affinity and back to Mac Photos

Thanks for the suggestion, which I've tried without success unfortunately. I'm waiting to hear from Dan about the issue of an App Store purchase v an Affinity store purchase to see if that is the problem,.

Dan – I'm using a copy I originally purchased from the Mac App store which has been automatically updated to 1.7.0

Many thanks – unfortunately I'm still getting the message after a restart.

I also have this problem. I can't edit a photo using the Affinity extension – I get the message "Affinity Photo could not be launched". I am running Mac OS 10.14.5 and Affinity 1.7.0. I would really like to be able to round–trip with Photos rather than editing a photo in Affinity and having to save it and re–import it to Photos. Any suggestions or advice grateful received.