Summarize this article:

Use the Android's charging cable to connect your Android to one of your computer's USB ports. If your Mac doesn't have a USB port, you will need to purchase a USB-C to USB-3.0 adapter. If your Android prompts you to select a connection type, tap Media device (MTP) on its screen before continuing. To do so: Go to http://www.android.com/filetransfer/ Click DOWNLOAD NOW Install Android File Transfer If Android File Transfer doesn't launch automatically, click the spaceship icon in your Dock, then click the green Android mascot icon. Depending on where the photos you want to transfer are stored and what kind of storage is available on your Android, you may see a slightly different option here. This is where all of your Android's photos are stored. Doing so will bring up a list of your Android's photos. Depending on whether or not your photos are in an album, you may have to open another folder before continuing. Click and drag your mouse across the photos you want to move onto your computer to select them. You can also hold down the Command key while clicking individual photos to select them independently. To select all photos in a folder, press Command+A. This menu item is in the upper-left side of your Mac's screen. A drop-down menu will appear. It's near the top of the Edit menu. Click the blue, face-like app in your Mac's Dock. Click a folder (e.g., All My Files) on the left side of the Finder window to select it as your photos' save location. The Edit drop-down menu will reappear. This will copy the photos from your Android onto your Mac, though it may take a few minutes for all of the selected photos to transfer.

Summary:
Connect your Android to your Mac. Download and install Android File Transfer. Open Android File Transfer. Double-click the "Internal storage" or "SD card" folder. Double-click the "DCIM" folder. Double-click the "Camera" folder. Select your Android's photos. Click Edit. Click Copy. Open Finder. Select a save location. Click Edit again. Click Paste Items.