Hi there,
Typically you would use the image.canon service (https://image.canon/st/en/index.html?region=1), but it looks like the Powershot G 9X is not currently supported by it. You can transfer with a USB cable using these intructions though.
1) Click on the Finder icon in your dock (the square smiley face with a line down the middle).
2) Select Applications.
3) Image Capture will be listed in here, double click it to open it.
4) Once Image Capture is open connect the camera and computer with the USB cable. At that point Image Capture should see the camera and begin showing the photos.
5) Once the photos are loaded in you can select the folder you want to save to at the bottom of the window and you can import with the Import button in the bottom right of the window.
If that doesn't work with the USB there is one other thing that you can try. The steps will be the same, but on step 4 you would plug the memory card into a memory card reader.
