Unity syncthing ignore file .stignore

.stignore

Temp/**
// This .gitignore file should be placed at the root of your Unity project directory
//
// Get latest from https://github.com/github/gitignore/blob/main/Unity.gitignore
//
*/Library/
*/Temp/
*/Obj/
*/Build/
*/Builds/
*/Logs/
*/UserSettings/

// MemoryCaptures can get excessive in size.
// They also could contain extremely sensitive data
*/MemoryCaptures/

// Recordings can get excessive in size
*/Recordings/

// Uncomment this line if you wish to ignore the asset store tools plugin
// Assets/AssetStoreTools*

// Autogenerated Jetbrains Rider plugin
/Assets/Plugins/Editor/JetBrains*

// Visual Studio cache directory
*/.vs/

// Gradle cache directory
*/.gradle/

// Autogenerated VS/MD/Consulo solution and project files
*/ExportedObj/
*/.consulo/
*/*.csproj
*/*.unityproj
*/*.sln
*/*.suo
*/*.tmp
*/*.user
*/*.userprefs
*/*.pidb
*/*.booproj
*/*.svd
*/*.pdb
*/*.mdb
*/*.opendb
*/*.VC.db

// Unity3D generated meta files
*/*.pidb.meta
*/*.pdb.meta
*/*.mdb.meta

// Unity3D generated file on crash reports
*/sysinfo.txt

// Builds
*/*.apk
*/*.aab
*/*.unitypackage
*/*.app

// Crashlytics generated file
*/crashlytics-build.properties

// Packed Addressables
*/Assets/AddressableAssetsData/*/*.bin*

// Temporary auto-generated Android Assets
*/Assets/StreamingAssets/aa.meta
*/Assets/StreamingAssets/aa/*

Thanks so much!

Syncthing as of 2024 needs double **'s to work in some cases.
What worked for me:

**/Temp/**
**/Library/**
**/Temp/**
**/Obj/**
**/Build/**
**/Builds/**
**/Logs/**

I added these in the basic GUI via Folder -> Edit -> Ignore Patterns tab.