diff --git a/cmd/tsconnect/wasm/wasm_js.go b/cmd/tsconnect/wasm/wasm_js.go
index 3834b255c..f3296346c 100644
--- a/cmd/tsconnect/wasm/wasm_js.go
+++ b/cmd/tsconnect/wasm/wasm_js.go
@@ -394,6 +394,25 @@ func (i *jsIPN) run(jsCallbacks js.Value) {
 		if n.BrowseToURL != nil {
 			jsCallbacks.Call("notifyBrowseToURL", *n.BrowseToURL)
 		}
+		if n.FilesWaiting != nil {
+			jsCallbacks.Call("notifyFilesWaiting")
+		}
+		if n.IncomingFiles != nil {
+			files := make([]jsIncomingFile, len(n.IncomingFiles))
+			for i, f := range n.IncomingFiles {
+				files[i] = jsIncomingFile{
+					Name:         f.Name,
+					Started:      f.Started.UnixMilli(),
+					DeclaredSize: f.DeclaredSize,
+					Received:     f.Received,
+				}
+			}
+			if b, err := json.Marshal(files); err == nil {
+				jsCallbacks.Call("notifyIncomingFiles", string(b))
+			} else {
+				log.Printf("could not marshal IncomingFiles: %v", err)
+			}
+		}
 	})
 
 	go func() {
@@ -921,6 +940,15 @@ func (w termWriter) Write(p []byte) (n int, err error) {
 	return len(p), nil
 }
 
+// jsIncomingFile is the JSON representation of an in-progress inbound file
+// transfer sent to the notifyIncomingFiles callback.
+type jsIncomingFile struct {
+	Name         string `json:"name"`
+	Started      int64  `json:"started"`      // Unix milliseconds; use new Date(started) in JS
+	DeclaredSize int64  `json:"declaredSize"` // -1 if unknown
+	Received     int64  `json:"received"`     // bytes received so far
+}
+
 type jsNetMap struct {
 	Self      jsNetMapSelfNode   `json:"self"`
 	Peers     []jsNetMapPeerNode `json:"peers"`