Mattermost desktop application does not render images hosted on SAML connected application.
Mattermost Server 5.22.0
Mattermost Desktop 4.4.2 & 4.5.0
The user is using the Mattermost API to post as a bot user to various teams / channels in their organization.
The API they are using to do this is documented in the Incoming Webhooks.
When they post Markdown that references an image hosted in another SAML-connected application, the image renders as expected in the web client since it appears to send the correct cookies.
The same image hosted on other SAML-connected applications should render as expected in the desktop client as well.
When the same message is viewed in the Mattermost desktop application, the image don't render and it is shown as a broken image icon.
Failure (Desktop 4.4.2)
Empty response content
Success (Web Browser)
These cookies are missing in the desktop client requests
No available workaround except using the web app.