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Use google drive and put those 50GB to use, or theres this tool which will transfer files from your mac to your android device. Pretty sure. I have windows.
The link posted above is for Android File transfer for Mac, which will work just fine. If both devices are connected to the same wifi router then consider a wireless solution, such as wifi file explorer, free in the Play Store.
Plus airdroid allows for much more than just pictures. You can copy files both ways and also text from any PC plus other things. Its one of the most versatile apps in the store and since it is through the web it requires no software or drivers.