The option to send an attached image via email notification on VIGI C350 does not work

Please note that this issue has been raised twice before, but the issue was not resolved:

https://community.tp-link.com/en/business/forum/topic/712344

https://community.tp-link.com/en/business/forum/topic/709292

Please do not mark as duplicate thread, as both threads above were closed without resolution

The option is as below:

Using Mailgun as an SMTP server, the emails are sent and received, but they are plain text only without an attachment. It looks like the email is incomplete, with the attachment truncated (see below email body)

Email body of notification email

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=mimeXGVHWTBGIB

Multipart MIME message.
--mimeXGVHWTBGIB
Content-Type: text/plain; charset="UTF-8"

This is an automatically generated text from your IPC
 						
Event  type:   Human Detection 						
Event  time:   Wed, 29 Oct 2025 10:39:06 						
Camera name:   VIGI C350 Front

--mimeXGVHWTBGIB--

Can you please provide troubleshooting steps or resolve the issue via firmware update?

Thanks