I am attempting to upload RAW photos shot with a Canon 7D Mk II...Lightroom indicates preview not available...any suggestions?
Yes, there is one suggestion. Wait for the next Lightroom update. No announced date. You could use the DPP software provided with your camera to create TIF copies that you could open now. However, it has been stated that DPP is not supported in Yosemite for the Mac.
However, it has been stated that DPP is not supported in Yosemite for the Mac.
Still the case unfortunately.
No doubt Canon is working on it but it's puzzling that Canon is so slow to issue updates. Not the first time either.