diff --git a/web/input/input-state-container.react.js b/web/input/input-state-container.react.js
--- a/web/input/input-state-container.react.js
+++ b/web/input/input-state-container.react.js
@@ -1215,6 +1215,8 @@
   // Creates a MultimediaMessage from the unassigned pending uploads,
   // if there are any
   createMultimediaMessage(localID: number, threadInfo: ThreadInfo) {
+    this.props.sendCallbacks.forEach(callback => callback());
+
     const localMessageID = `${localIDPrefix}${localID}`;
     this.startThreadCreation(threadInfo);