Downloads a file, deletes it, then uploads the same file with updated properties

Replace-SPFile.ps1

Add-PSSnapin -Name Microsoft.SharePoint.Powershell

function Get-SPFile
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory=$true)][string]$FileUrl
    )
    
    begin
    {
    }
    process
    {
        try
        {
            $site = New-Object Microsoft.SharePoint.SPSite($FileUrl)

            $web = $site.OpenWeb()

            $web.GetFile($FileUrl)
        }
        finally
        {
            if( $web )
            {
                $web.Dispose()
            }

            if( $site )
            {
                $site.Dispose()
            }
        }
    }
    end
    {
    }
}

function Replace-SPFile
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory=$true)][Microsoft.SharePoint.SPFile]$File,
        [parameter(Mandatory=$true)][string]$DefaultLogin
    )
    
    begin
    {
    }
    process
    {

        # attempt to use current author
        if( $File.Author )
        {
            $author = $File.Author
        }
        else
        {
            $author = $File.ParentFolder.ParentWeb.EnsureUser($DefaultLogin)
        }

        # attempt to use current editor
        if( $File.ModifiedBy )
        {
            $editor = $File.ModifiedBy
        }
        else
        {
            $editor = $File.ParentFolder.ParentWeb.EnsureUser($DefaultLogin)
        }

        # pull other props
        $filesCollection   = $File.ParentFolder.Files
        $timeCreated       = $File.TimeCreated
        $timeLastModified  = $File.TimeLastModified
        $serverRelativeUrl = $File.ServerRelativeUrl
        $properties        = @{}
        try
        {
            $stream = $File.OpenBinaryStream()
            $bytes = New-Object byte[] $($stream.Length)
            $stream.Read($bytes, 0, $stream.Length) | Out-Null
        }
        finally
        {
            if( $stream )
            {
                $stream.Dispose()
            }
        }

        # delete current file
        $File.Delete()

        # replace file with new props
        $filesCollection.Add($serverRelativeUrl, $bytes, $properties, $author, $editor, $timeCreated, $timeLastModified, $true ) | Out-Null
    }
    end
    {
    }
}

$defaultLogin = "i:0#.w|contoso\adamb"

$file = Get-SPFile -FileUrl "https://sharepoint.2016.contoso.com/sites/teamsite/shared documents/book1.xlsx"

Write-Host "Staring Author:$($file.Properties.vti_author)"
Write-Host "Staring Editor:$($file.Properties.vti_modifiedby)"

if( $file.Exists )
{
    Replace-SPFile -File $file -DefaultLogin $defaultLogin
}

$file = Get-SPFile -FileUrl "https://sharepoint.2016.contoso.com/sites/teamsite/shared documents/book1.xlsx"

Write-Host "Ending Author:$($file.Properties.vti_author)"
Write-Host "Ending Editor:$($file.Properties.vti_modifiedby)"