Cannot access RAW files in Photos.app
I cannot access RAW image files in Photos.app. I have a bunch of RAW files from both my Olympus OM-D E-M5 and from my iPhone (I use the Halide app to take them). They are all JPG/RAW pairs.
The photos display with the little J icon in the top right corner but the "Image > Use RAW as Original" option in the menu is greyed out. I'm pretty sure I had this working in the past.
If I dig into the Photo Library with the terminal I can see that the ORF (Olympus RAW Format) and DNG (Digital Negative) files are there. I just cannot access them from Photos app.
My library is an iCloud Photo Library and on iOS if I use apps that know about RAW files, such as Darkroom, they are able to open the RAW versions. I have "Download Originals" configured on my Mac.
I'm on Mojave 10.14.6 and Photos is Version 4.0 (3461.7.140)