If you recently clicked a link, check your Chrome or Firefox download history ( Ctrl+J or Cmd+Shift+J ) to find the source.
If this file was attached to a draft email you can't access, tools like Mail Attachment Downloader can help batch-download attachments from mail servers. Where Do My Downloads Go?
If you are sending this file to someone else, you can use this draft:
Scan to wechat：
