I used Unison to sync between two laptops. In using only one laptop now and I switched to Syncthing to sync some folders of my phone, tablets and laptop. Unfortunately Unison doesn't run on Android. I liked the way it could perform a merge of the folders from different computers.
I haven't tried unison yet, but you can mount android on your laptop wirelessly over ssh.
Enable your android phone's hotspot, and connect your laptop to that hotspot.
Install termux on android (playstore). Install openssh in termux. Setup passwordless pub/private keys to log in from laptop to android termux sshd.
cat ~/.ssh/config # Laptop.
Host someName # Your android.
User u0_a168 # Whatever username termux gave you.
HostName 192.168.43.1 # 'ifconfig' in termux for this.
IdentityFile /home/you/.ssh/someName_id_rsa
Port 8022 # Default termux sshd port.
Now this should work from your laptop:
ssh someName
Log out of your laptop's termux session.
Install sshfs on your laptop, through your package manager or the manly way from github. I'm not manly.
Here's part of a script I use to get photos from my phone to my laptop.
# Mount the phone's DCIM directory locally over ssh.
# I had trouble with termux symlinks, so I went directly to /storage/...
sshfs someName:/storage/emulated/0/DCIM ~/mnt/someName
cd ~/mnt/someName/Camera
cp -vn * ~/Pictures/. # Copy all pictures that aren't yet on laptop.
mv * ../Saved/. # So ops on dcim/Camera don't take longer with more pics.
cd ~/Pictures # Can't unmount until leave mount.
fusermount -u ~/mnt/someName # Dismount. Gymnastic salute.
# Do whatever postprocessing you like on your photos ...
