How to Add an Attachment to Outlook Email: Step-by-Step

• Open a draft first with New mail , Reply , Reply all , or Forward .
• Use Attach File on desktop, Attach on the web, or the paperclip on mobile.
• Choose files from your device, recent files, OneDrive, SharePoint, or another connected cloud location.
• Pick a cloud link for a smaller email and one live file, or a copy for a standard attachment.
• Confirm the file name, attachment chip, or cloud link is visible in the draft before sending.
• If a file is too large or blocked, send a cloud link or compress it into a ZIP file first.
• Replies do not keep the original attachment, so add it again if the recipient needs it.

Sources: ^{[4] [5] [6] [7] [9] [10]}

• Prerequisites: Outlook open in the version you use most, plus the file already saved on your device or in cloud storage.
• Tools: A computer or phone, and internet access if the file lives in OneDrive, SharePoint, or another connected cloud location.
• Time: About 1–3 minutes for one file once the file is ready.
• Cost: No extra cost for the attachment step itself.
• Safety: Outlook blocks some risky file types. If a file is too large or blocked, send a cloud link or a ZIP file when appropriate.

Sources: ^{[3] [4] [5] [7] [9] [10]}

How to add an attachment to an Outlook email: step by step

1. Open a draft first

   Start the email before you hunt for the file. Click New mail , or open the message you want and choose Reply , Reply all , or Forward . In Outlook on the web, use + New message . On mobile, open the compose screen. Check: you should now see a draft area where you can type your message. ^{[4] [6] [7]}

2. Confirm which Outlook version you are using

   Attachment controls look a little different by version. If Outlook is open in a browser, you are in Outlook on the web or Outlook.com. If you are on iPhone or Android, you are in Outlook mobile. If you are in the Windows desktop app and see a File tab, you are in classic Outlook. Microsoft’s newer Outlook layout is different from classic Outlook, so older screenshots may not match exactly. Check: you know which labels match your screen. ^{[1] [2] [3] [7]}

3. Click the attachment control

   In desktop Outlook, choose Attach File . In Outlook on the web, click Attach . On mobile, tap the paperclip in the compose screen. Check: a file picker or attachment menu opens. ^{[4] [6] [7]}

4. Choose where the file lives

   Pick the source that matches your file: recent or suggested files, your computer, OneDrive, SharePoint, or another connected cloud location. On mobile, you can also choose files or photos from your device and, depending on your setup, take a new photo. Check: you can see the file list you need. ^{[4] [5] [7]}

5. Select the file and insert it

   Click the file, then choose Open or Insert . If you are in Outlook on the web and need more than one file, hold Ctrl on Windows or Command on Mac while selecting multiple files. Check: the picker closes and Outlook returns to your draft. ^[5]

6. Choose copy or link when Outlook offers both

   If the file comes from OneDrive or SharePoint, Outlook may let you send a full copy or a shareable link. Choose a link when you want a smaller email and one live file with editable permissions. Choose a copy when the recipient should receive a standard attachment that does not depend on cloud access. Check: the option you picked matches how you want the recipient to use the file. ^{[4] [9]}

7. Confirm the attachment is actually visible

   Pause for two seconds and check the draft. You should see the file name, attachment chip, or a cloud link before you keep typing. If you do not see it, attach the file again now instead of finding out after you send. Check: the attachment is visible in the draft. ^{[4] [5]}

8. Use the right path for pictures

   If you want a photo to appear inside the email body, use Insert > Pictures instead of the normal attachment path. If you want the photo to arrive as a downloadable file, use the paperclip or Attach File . Check: the image is either shown inline or listed as an attachment—whichever you meant to send. ^{[4] [5]}

9. Fix large or blocked files before sending

   If the file is too large, upload it to cloud storage and send a link, or compress it into a ZIP file first. If Outlook blocks the file type because it is risky, Microsoft recommends sharing it through OneDrive or another secure cloud location instead. Check: the file is now either smaller, zipped, or shared as a link. ^{[9] [10]}

10. Send the email and pay attention to warnings

    Click Send . If Outlook warns that you mentioned an attachment but forgot to include one, stop and add it. If you are replying and need the original file to go back out, attach it again before sending. Check: the message sends without an attachment error. ^{[5] [6]}

• Opened a new draft, reply, or forward.
• Confirmed whether you are in new Outlook, classic Outlook, web, or mobile.
• Clicked the correct attachment button for that version.
• Picked the right file source: device, recent file, or cloud storage.
• Chose copy or link on purpose.
• Checked that the file name or link is visible before sending.
• Used inline insert only when you wanted the picture inside the message body.
• Switched to a cloud link or ZIP if the file was too large or blocked.
• Reattached the file if you were replying and needed it included.
• Sent only after the draft showed the attachment clearly.

Checklist summary based on Microsoft’s Outlook support pages for version checks, attachments, web, mobile, large files, and blocked files. ^{[3] [4] [6] [7] [9] [10]}