Yeah, that's a pain for sure. Apparently, use Android file transfer from here (www.android.com/filetransfer). then attach a usb cable to your phone, then a free usb port on your Mac. Tap on USB charging, then tap on Transfer Media Files, then, on your Mac, open Android File transfer. then open DCIM folder, then Camera folder, choose the photos you want to transfer, drag 'em to a folder on your mac and detach the usb cable from your mac. Don't use/install Samsung KIES and Android File transfer at the same time-apparently they mess with each other. Oh, and this might be helpful if you're using SideSync :
go into system preferences, then security and privacy then accessibility then unlock, then put a tick next to SideSync to allow it to do its thing, then click the lock again, and get the latest version. You can also transfer files over Wifi, maybe bluetooth-perhaps
maybe airdroid (www.airdroid.com) ??
sorry, that's all I have
John B