使用PowerShell从SharePoint online提取附件

Connect-SPOService -Url https://yourdomain-admin.sharepoint.com

Set-SPOContext -Site https://yourdomain.sharepoint.com/sites/your-site

$web = Get-SPOWeb -Identity "your-library"
$list = $web.Lists.GetByTitle("your-list")
$item = $list.GetItemById(your-item-id)
$attachments = $item.AttachmentFiles
foreach ($attachment in $attachments) {
    $attachmentFileName = $attachment.FileName
    $attachmentFile = $attachment.OpenBinary()
    $fileStream = New-Object System.IO.FileStream("C:\Path\To\Save\Attachments\$attachmentFileName", [System.IO.FileMode]::Create)
    $fileStream.Write($attachmentFile, 0, $attachmentFile.Length)
    $fileStream.Close()
}