You omitted to mention the Camera model.
If you prefer processing RAW images with ACR instead of the camera maker’s proprietary software you might want to petition them to allow shooting DNG so that Adobe does not have to play catch-up with each new camera model’s RAW format.
Please see for yourself which version of Camera Raw supports a camera and which version of Photoshop is compatible with that ACR version:
Using the free DNG Converter would be an alternative.
Camera Model is Sony RX10 Mark III checked on Adobe website camera is compatable
That camera is compatible with ACR 9.5.1 and Photoshop CS6 is compatible with up to ACR 9.1.1.
How do I open up a picture in RAW via photoshop as it only appears as TIFF DNG is installed
Well, is it a RAW file or a plain tiff?
• you have decided to use an obsolete version of Photoshop and
• Sony has decided to release another RAW file format
you can use the free DNG Converter.