[Bug]: File share links not present in MessageActivity

[Maxi-J]

Bug Description

When the user attaches a file in teams - in the 1:1 chat with the Teams app - and that file is from some file share (SharePoint or OneDrive; like the file suggestions when clicking on the clip in Teams) and not a file from the local computer, there is nothing whatsoever in the MessageActivity context present. Not in ctx.attachment or otherwise. Therefore, these attachments are completely invisible to the Teams app. For local files all works as expected.

Steps to Reproduce

1. Set up a message input hook
2. Attach a file from a file share like OneDrive or SharePoint that Teams probably automatically sends more as reference than as a file I'd assume
3. Check ctx.attachment and see there is nothing but the text message the user put in along with the attachment

Expected Behavior

The attached file is present in ctx.attachment like with locally uploaded files.

Actual Behavior

No trace of any attachment is present whatsoever.

SDK Version

2.0.13.4

Python Version

3.14.6

Additional Context

The environment is an business setup with SSO for SharePoint, OneDrive, Teams etc and is connected together - in case that changes things.
If you need debug logs or something - feel free to let me know and how to get the information you need.

[singhk97]

@Maxi-J thanks for opening this issue I've added this to the backlog. Will attempt to repro this scenario.

[dcaayushd]

hey @Maxi-J , could you add a quick debug log and share the raw activity JSON? something like print(ctx.activity.model_dump_json(indent=2)) in your message handler. that'll show us exactly which field Teams is using for the SharePoint file so we can wire it up correctly. thanks!

[Maxi-J]

Sure! I've ran the model dump for both the success case and the failure case.

Failure case

{
  "serviceUrl": "https://smba.trafficmanager.net/emea/REDACTED/",
  "timestamp": "2026-07-03T13:44:04.349313Z",
  "locale": "de-DE",
  "localTimestamp": "2026-07-03T15:44:04.349313+02:00",
  "channelId": "msteams",
  "from": {
    "id": "REDACTED",
    "aadObjectId": "REDACTED",
    "type": null,
    "properties": null,
    "isTargeted": null,
    "name": "REDACTED"
  },
  "conversation": {
    "id": "REDACTED",
    "tenantId": "REDACTED",
    "conversationType": "personal",
    "name": null,
    "isGroup": null
  },
  "replyToId": null,
  "entities": [
    {
      "type": "clientInfo",
      "locale": "de-DE",
      "country": "DE",
      "platform": "Windows",
      "timezone": "Europe/Berlin"
    }
  ],
  "channelData": {
    "channel": null,
    "eventType": null,
    "team": null,
    "notification": null,
    "tenant": {
      "id": "REDACTED"
    },
    "meeting": null,
    "settings": null,
    "feedbackLoopEnabled": null,
    "feedbackLoop": null,
    "streamId": null,
    "streamType": null,
    "streamSequence": null
  },
  "type": "message",
  "id": "REDACTED",
  "recipient": {
    "id": "REDACTED",
    "aadObjectId": null,
    "type": null,
    "properties": null,
    "isTargeted": null,
    "name": "My App Name"
  },
  "text": "this message has a shared teams/sharepoint file attached",
  "summary": null,
  "textFormat": "plain",
  "attachmentLayout": null,
  "attachments": [
    {
      "contentType": "text/html",
      "contentUrl": null,
      "content": "<p>this message has a shared teams/sharepoint file attached</p>",
      "name": null,
      "thumbnailUrl": null
    }
  ],
  "suggestedActions": null,
  "deliveryMode": null,
  "value": null,
  "localTimezone": "Europe/Berlin"
}

Success case (OneDrive file work)

{
  "serviceUrl": "https://smba.trafficmanager.net/emea/REDACTED/",
  "timestamp": "2026-07-03T13:41:35.378661Z",
  "locale": "de-DE",
  "localTimestamp": "2026-07-03T15:41:35.378661+02:00",
  "channelId": "msteams",
  "from": {
    "id": "REDACTED",
    "aadObjectId": "REDACTED",
    "type": null,
    "properties": null,
    "isTargeted": null,
    "name": "REDACTED"
  },
  "conversation": {
    "id": "REDACTED",
    "tenantId": "REDACTED",
    "conversationType": "personal",
    "name": null,
    "isGroup": null
  },
  "replyToId": null,
  "entities": [
    {
      "type": "clientInfo",
      "locale": "de-DE",
      "country": "DE",
      "platform": "Windows",
      "timezone": "Europe/Berlin"
    }
  ],
  "channelData": {
    "channel": null,
    "eventType": null,
    "team": null,
    "notification": null,
    "tenant": {
      "id": "REDACTED"
    },
    "meeting": null,
    "settings": null,
    "feedbackLoopEnabled": null,
    "feedbackLoop": null,
    "streamId": null,
    "streamType": null,
    "streamSequence": null
  },
  "type": "message",
  "id": "REDACTED",
  "recipient": {
    "id": "REDACTED",
    "aadObjectId": null,
    "type": null,
    "properties": null,
    "isTargeted": null,
    "name": "My App Name"
  },
  "text": "this message has a onedrive file attached",
  "summary": null,
  "textFormat": "plain",
  "attachmentLayout": null,
  "attachments": [
    {
      "contentType": "application/vnd.microsoft.teams.file.download.info",
      "contentUrl": "https://REDACTED.sharepoint.com/personal/REDACTED/Documents/Microsoft Teams-Chatdateien/file.pdf",
      "content": {
        "downloadUrl": "REDACTED",
        "uniqueId": "REDACTED",
        "fileType": "pdf"
      },
      "name": "file.pdf",
      "thumbnailUrl": null
    },
    {
      "contentType": "text/html",
      "contentUrl": null,
      "content": "<p>this message has a onedrive file attached</p>",
      "name": null,
      "thumbnailUrl": null
    }
  ],
  "suggestedActions": null,
  "deliveryMode": null,
  "value": null,
  "localTimezone": "Europe/Berlin"
}

If there is a way to get deeper logs, let me know. I don't see any hint of a file in the activity object.