I am absolutely
not a tech genius, but what worked for me was this:
1. Go to Google's Android Studio page here:
https://developer.android.com/studio/index.html
Scroll down the page to where it says "Get just the command line tools" and select the command line tools for Mac to download them.
You do this to get a program called "adb", which is part of the android studio sdk and stands for "android debug bridge". You can use this program to copy files from your phone to your computer, or from your computer to your phone.
2. Go into your downloads folder and unzip the android studio command line tools file. If I remember correctly it will create a folder directly in your Downloads called something like "android sdk". In a sub-folder (or possibly a sub-sub-folder) somewhere inside the android sdk folder there will be an executable file called "adb". (I'm sorry I can't tell you more specifically what the folder names are....my Mac died a while back and I'm currently using an old PC ....the subfolder in the /Downloads/[android sdk] folder might be called "platform tools" or something similar. If I've remembered this completely wrong then there will be an install process you have to follow first/instead.... and it might be different anyways if you have a different version of the OS than I was using, which you probably do because I never updated to Sierra.....but there will be a way for you to download and install the android sdk command line tools, even if I can't tell you off-hand what it is and would have to look it up.)
3. Open a Terminal window (if you aren't already doing all the unzipping and stuff in a Terminal window) and navigate to your Downloads folder, then to the unzipped android sdk tools folder, then to the subfolder that contains adb. (To navigate to your Downloads folder just type in "Downloads" and hit enter -- if that doesn't work then type in "~/Downloads". Then to navigate to the android sdk tools folder type in its name, and so on with folder names until you're in the folder that contains the adb executable. Or note the entire pathname while you're in Finder and type that in instead.)
4. Turn on developer options on your phone. (Go to "about phone" in the settings menu. Within "about phone" go to "build version" and tap it 7 times.) You need developer options turned on to be able to use adb.
5. Navigate back to the main settings menu on your phone, then go into the new "developer options" and turn on "allow USB debugging".
6. Find the location (file pathname) of the photos on your phone. You can use the Terminal program on your phone (which you turn on by going into "developer options" again and turning on "local terminal"), or possibly the File Manager. A google search of your phone's model and words/phrases like "photos"+"storage" or "photos stored in" might help you find it if you have trouble -- but make sure you double-check that whatever you find on the internet actually applies to your phone. It may be helpful to write down the pathname once you find it.
7. Plug your phone into your computer. In the Terminal window on your computer (where you should still be in the folder with adb in it), type "./adb devices" and hit enter.
It should list your phone (and only your phone, unless you've got multiple android phones plugged into your computer for some reason), probably as a device ID number, but if it doesn't then check your phone to see if a dialogue window has come up asking you whether or not you want to allow USB debugging -- Select the "yes" option, and then try typing "./adb devices" into your computer's Terminal window again.
Once "./adb devices" lists your phone:
7. In your computer's Terminal window, type in "./adb pull [location of the photos on your phone, e.g. "/sdcard/camera" or whatever it happens to actually be on your phone] [location where you want to put the photos on your computer, e.g. "/Users/username/Documents/Photos" or whatever it happens to be]" and hit enter.
Your photos should be copied to your computer in the location you specified. (The whole folder of all your photos will be copied.)
If my instructions suck massively or don't work, there is also documentation for adb on the Android Studio website:
https://developer.android.com/studio/command-line/adb.html#howadbworks
You can probably also find youtube videos of how to do this by doing a google search for your phone's model number, "adb" and keywords like "file transfer" or "transfer photos".