Copy the Network files to the document library of sharepoint

You can use a PowerShell script and schedule it using Windows Scheduler to run at a specific time every day.

People would argue to use SP Timer Jobs, but having the good old Scheduled jobs makes it cloud ready considering Microsoft shift to Office 365 where you can not run a Full Trust solution.

This script should help:

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")
if((Get-PSSnapin | Where {$_.Name -eq "Microsoft.SharePoint.PowerShell"}) -eq $null) {
     Add-PSSnapin Microsoft.SharePoint.PowerShell;
 }

#Site Collection where you want to upload files
$siteCollUrl = "http://SPWebApplication/sites/Upload" 
#Document Library where you want to upload files
$libraryName = "Shared Documents"
#Physical/Network location of files
$reportFilesLocation  = "C:\Users\manas\Desktop\File"

$spSourceWeb = Get-SPWeb $siteCollUrl;
$spSourceList = $spSourceWeb.Lists[$libraryName];
   
if($spSourceList -eq $null)
{
	Write-Host "The Library $libraryName could not be found."
	return;
}

$files = ([System.IO.DirectoryInfo] (Get-Item $reportFilesLocation)).GetFiles()
foreach($file in $files)
{ 
	#Open file
	$fileStream = ([System.IO.FileInfo] (Get-Item $file.FullName)).OpenRead()
 
	#Add file
	$folder =  $spSourceWeb.getfolder($libraryName)
 
	Write-Host "Copying file $file to $libraryName..."
	$spFile = $folder.Files.Add($folder.Url + "/" + $file.Name, [System.IO.Stream]$fileStream, $true)
		 
	#Close file stream
	$fileStream.Close();
					   
}
$spSourceWeb.dispose();
Write-Host "Files have been uploaded to $libraryName." 

[EDIT]: I just blogged about this question with more details. See here:

http://manasbhardwaj.net/upload-files-library-sharepoint-2013-using-powershell/[^]