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Original file line number Diff line number Diff line change
Expand Up @@ -218,5 +218,6 @@ When a client sends an [Activity](bot-framework-rest-connector-api-reference.md#
- The `from` property must be populated with a user ID, chosen by the client.
- Attachments may contain URLs to existing resources or URLs uploaded through the Direct Line attachment endpoint.
- The `channelData` property is preserved without modification.
- The total size of the activity, when serialized to JSON, must not exceed 300K characters.

Clients may [send](bot-framework-rest-direct-line-3-0-send-activity.md) a single activity per request.