If you are using Photos, then you want to use the RAW Power Extension.
You access this within Photos’ Edit view. Click the “…” button and select RAW Power.
When you use the extension, editing information is stored inside the Photos library and edits are non-destructive.
Note: RAW Power will get access to the RAW, unless the image has already been edited (by Photos or by another extension)
The “Edit With” feature of Photos converts the RAW to a TIFF and sends that instead. “Edit With” is intended for applications that don’t support RAWs.