Bug

Inline pasted images in MSTeams DM and group conversations are not downloaded. The Teams Graph API returns hostedContents without contentBytes, so the current download logic silently fails.

Reproduction

1. Configure MSTeams provider
2. Paste an image inline in a DM conversation with the bot
3. Image attachment is detected but content is empty/not saved

Root cause

The hostedContents collection in the activity attachment doesn't include contentBytes directly. The fix is to download the image via the contentUrl using the bot's auth token instead of relying on the inline content bytes.

Environment

• OpenClaw v2026.3.13-1
• @microsoft/agents-hosting@1.3.1
• Confirmed reproducible on current main

Related

• Supersedes MSTeams: hostedContents collection response missing contentBytes - images not downloaded in group chats #5448 (locked/closed as NOT_PLANNED, but bug is still present)
• Previous fix PR fix(msteams): fix inline pasted image downloads #10902 (closed by stale bot)
• New fix PR incoming