$username = "admin" 
$password = " PASSWORD123 " 
$password_base64 = ConvertTo-SecureString $password -AsPlainText -Force 
$creds = New-Object System.Management.Automation.PSCredential ($username, $password_base64) 


$fileName = ".\test3.csv"
$uri = "https://epo:8443/rest/dlp/userInfo/import"

$currentPath = Convert-Path .
$filePath="$currentPath\$fileName"

$fileBin = [System.IO.File]::ReadAlltext($filePath)
$boundary = [System.Guid]::NewGuid().ToString()
$LF = "`r`n"
$bodyLines = (
"--$boundary",
"Content-Disposition: form-data; name=`"importFile`"; filename=`"$fileName`"",
"Content-Type: application/octet-stream$LF",
$fileBin,
"--$boundary--$LF"
) -join $LF

Invoke-RestMethod -Uri $uri -Method Post -Credential $creds -ContentType "multipart/form-data; boundary=`"$boundary`"" -Body $bodyLines