Webmail does not display attachments in message view, although JMAP download works

[melges-morgen]

Hi, I am trying to set up Stalwart + Webmail with SSO authentication and have encountered an issue when sending emails from Gmail.

Emails with attachments are displayed without any attachment block in Stalwart Webmail, even though the attachment exists and can be downloaded.

I can confirm:

• The message opens normally
• The attachment indicator is present
  However, no attachment is shown in the UI

When sending the same file from Webmail to Webmail, the issue does not occur.

email source

[gitzec]

Try Bulwark instead. Just found it here: stalwartlabs/stalwart#513