Attachment not attached in Outlook mail system in C# UWP

Jay 140

Hi, I am trying to attach a file in the Outlook mail system using C# UWP, but it's not working. It works fine in the old Mail app. Could you please help?

Code:

EmailMessage emailMessage = new EmailMessage(); 
StorageFile attachmentFile = await storageFolder.GetFileAsync("TXT_Files\\Purchase Status.txt");
 if (attachmentFile != null)
 {
     var stream = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(attachmentFile);
     var attachment = new Windows.ApplicationModel.Email.EmailAttachment(attachmentFile.Name, stream);
     emailMessage.Attachments.Add(attachment);
 }
await EmailManager.ShowComposeNewEmailAsync(emailMessage);

Junjie Zhu - MSFT 18,391 Reputation points Microsoft Vendor

2024-10-03T07:13:49.0266667+00:00

Hi @Jay ,

This is a known issue.

If you want to solve this problem in UWP, I think you may need to use Desktop Bridge to launch desktop application from UWP, and call System.Net.Mail to send emails with attachment.

This requires UWP to run under full trust permissions, in simple terms, UWP will leave the sandbox. You need to consider the pros and cons.

Thank you.
Jay 140 Reputation points

2024-10-03T07:26:05.2+00:00

Okay Thanks @Junjie Zhu - MSFT

Accepted answer

Viorel 118K Reputation points

2024-10-02T16:47:38.3966667+00:00
It seems that the attachments “... will appear only in the Mail app. If users have any other mail program configured as their default mail program, the compose window will appear without the attachment. This is a known issue”:

https://learn.microsoft.com/en-us/windows/uwp/contacts-and-calendar/sending-email#launch-the-compose-email-dialog

To work around the momentary known issue, maybe you can insert the Purchase Status to the body of email.
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1 person found this answer helpful.
Jay 140 Reputation points

2024-10-03T05:46:04.4833333+00:00

Hi @Viorel

Thank you for your kind reply. However, Outlook is also a mail app, and now, when I open the old mail app, it automatically redirects to the latest Microsoft Outlook Mail app. I thought it would work in the latest Outlook Mail app, but it doesn’t.

To work around the momentary known issue, maybe you can insert the Purchase Status to the body of email.

Yes, but our app is an invoicing app, and we need to attach the invoice PDF to the email. Most of our users have complained that they cannot attach any PDFs in the Outlook mail app, so we need a solution or an alternative for this issue.
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