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Requirements

• A Mint laptop, any version.
• An Android phone, any version.
• A wifi hotspot. 

Preparations

• Install Syncthing both on Mint laptop and Android phone[1].
• Create a new folder named Sync on both laptop and phone.
  
• Start Syncthing on both devices[2].
• On phone, first add new device (laptop), then second, create new folder[3].
• On laptop, after two notifications appear: first add new device (phone), then second, add new folder (from phone)[4].
• Preparations done = both devices say 'up to date'.
  

 (Before sharing, both Sync folders on both devices are empty)

Start Sharing

1. From laptop to phone: copy files and folders you wish to share into Sync folder.
   
2. From phone to laptop: using your Android file manager, copy files/folders you want to share into Sync. 
   

Explanations

See below the details and pictures on how to setup the preparations.

[1] Installation:

On Mint laptop:

$ sudo apt-get install syncthing-gtk

On Android phone: install F-Droid and then install Syncthing from it. 

[2] Starting:

Both Syncthings must be active!

• On Mint: run Syncthing-GTK from start menu.
• On Android: run Syncthing.

If it asks you to run a certain service, click OK. Below is the picture when we created two new empty folders named Sync on both devices.

[3] Phone preparation:

1. On Syncthing laptop, on click gear button > Show ID > a QR Code appears on screen.
   
2. On Syncthing phone, open Devices page > tap plus button > Add Device appears > tap QR Code button > a scan screen appears > scan QR Code on laptop screen > your laptop detected.
3. Still on phone, type the name: Laptop > tap check mark button > a new device "Laptop" added in Syncthing phone.
4. Still on phone, open Folders page > tap plus button > Create Folder appears > type the name: Sync > change directory path to a folder that will connect to the laptop > enable "Laptop" selection > change folder type to: Send & Receive > tap check mark button > a sync folder created.

[4] Laptop preparation:

1. Wait for a few seconds, 1st notification of a new device i.e. your phone appears > click Add button > change Device Name: Phone > Save > a new device "Phone" added.
   
2. Not too long after that, 2nd notification of a new remote folder i.e. Sync sent from your phone appears on your desktop > accept it > change Folder Label: Sync > change Path: /home/master/Sync by replacing master with your own username > change rescan interval: 10s > add check mark to Monitor filesystem for changes > remove check marks to other ones > switch to Share With Devices tab > add check mark to Phone > Save > a sync folder "Sync" added.
   
3. Up to date status with green background appears like picture below. 
   
4. Now your devices are ready to share files.