Your new camera is not yet on the list of supported cameras: See here:
- You could import your image files as raw+jpeg pairs for the time being, with the master file set to the jpeg. When later the raw will be supported, switch to the raw file as master.
- Or use the raw converter that comes with your camera to develope the raw and import the image files to APerture as tiff files.
- Or check, if Adobe's DNG converter already supports your camera. Then you could import dng-files instead to work with the raw.