backgrounds.ps1

# Create variables
$sourcefolder = "{Source Folder Here}" # Set the share and folder where you put the custom backgrounds
$TeamsStarted = "$env:APPDATA\Microsoft\Teams"
$DirectoryBGToCreate = "$env:APPDATA\Microsoft\Teams\Backgrounds"
$Uploadfolder = "$env:APPDATA\Microsoft\Teams\Backgrounds\Uploads"
$Logfile = "$env:LOCALAPPDATA\Logs\BG-copy.log"
$Logfilefolder = "$env:LOCALAPPDATA\Logs"
# Create logfile and function
# Check if %localappdata%\Logs is present, if not create folder and logfile
if (!(Test-Path -LiteralPath $Logfilefolder -PathType container)) {
        try {
                New-Item -Path $Logfilefolder -ItemType Directory -ErrorAction Stop | Out-Null #-Force
                New-Item -Path $Logfilefolder -Name "BG-copy.log" -ItemType File -ErrorAction Stop | Out-Null #-Force
                Start-Sleep -s 10
        } catch {
                Write-Error -Message "Unable to create directory '$Logfilefolder' . Error was: $_" -ErrorAction Stop    
        }
        "Successfully created directory '$Logfilefolder' ."
} else {
        "Directory '$Logfilefolder' already exist"
}
# Clear the logfile before starting
Clear-Content $Logfile
# Create the logwrite function
Function LogWrite {
        Param ([string]$logstring)
        $Stamp = (Get-Date).toString("dd/MM/yyy HH:mm:ss")
        $Line = "$Stamp $logstring"
        Add-content $Logfile -value $Line
}

# Check if teams is started once before for current user
if ( (Test-Path -LiteralPath $TeamsStarted) ) { 
        logwrite "Teams started once before by the current user."
} else {
        logwrite "Teams has never been started by user"
        Exit 1
}

# Check if %appdata%\Microsoft\Teams\Background is present, if not create folder
if (!(Test-Path -LiteralPath $DirectoryBGToCreate -PathType container)) {
        try {
                New-Item -Path $DirectoryBGToCreate -ItemType Directory -ErrorAction Stop | Out-Null #-Force
        } catch {
                Write-Error -Message "Unable to create directory '$DirectoryBGToCreate' . Error was: $_" -ErrorAction Stop    
        }
        logwrite "Successfully created directories '$DirectoryBGToCreate' ."
} else {
        logwrite "Directory '$DirectoryBGToCreate' already exist"
}

# Check if %appdata%\Microsoft\Teams\Background\Uploads is present, if not create folder
if (!(Test-Path -LiteralPath $Uploadfolder -PathType container)){
        try {
                New-Item -Path $Uploadfolder -ItemType Directory -ErrorAction Stop | Out-Null #-Force
        } catch {
                Write-Error -Message "Unable to create directory '$Uploadfolder' . Error was: $_" -ErrorAction Stop    
        }
        logwrite "Successfully created directories '$Uploadfolder' ."
} else {
        logwrite "Directory '$Uploadfolder' already exist"
}
Copy-Item -Path L:\Source\Teams_Backgrounds\* -Destination $env:APPDATA\Microsoft\Teams\Backgrounds\Uploads -PassThru
# Stop Teams
Get-Process "Teams" -ErrorAction SilentlyContinue | Stop-Process
#
# Do what you need to here
#
# change to the correct directory
Set-Location ($ENV:USERPROFILE + '\AppData\Local\Microsoft\Teams')
# start Teams
Start-Process -File "$($env:USERProfile)\AppData\Local\Microsoft\Teams\Update.exe" -ArgumentList '--processStart "Teams.exe"'