I need to re-export some old photos with different settings (quality/size/etc.). Usually that's pretty straightforward: Enable a filter to show only picked photos, select all, export.
However, in one collection I do not have any photos marked as "picked" for some reason (maybe I exported everything and deleted bad photos afterwards... or the information got lost somehow). I still have the "good" JPEGs though.
Now I'd like to set the "pick" flag for all photos where a JPEG file exists (or whose filenames are in some list) - that's about 100 out of 700 photos so doing it manually for each photo is not an option. Is there any way to do this?