diff --git a/cmd/tsconnect/wasm/wasm_js.go b/cmd/tsconnect/wasm/wasm_js.go
index 38f44a9bc..b76f23de0 100644
--- a/cmd/tsconnect/wasm/wasm_js.go
+++ b/cmd/tsconnect/wasm/wasm_js.go
@@ -405,6 +405,7 @@ func (i *jsIPN) run(jsCallbacks js.Value) {
 					Started:      f.Started.UnixMilli(),
 					DeclaredSize: f.DeclaredSize,
 					Received:     f.Received,
+					Done:         f.Done,
 				}
 			}
 			if b, err := json.Marshal(files); err == nil {
@@ -967,6 +968,7 @@ type jsIncomingFile struct {
 	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
+	Done         bool   `json:"done"`         // true once the file has been fully received
 }
 
 // jsOutgoingFile is the JSON representation of an outgoing file transfer
diff --git a/feature/taildrop/send.go b/feature/taildrop/send.go
index 668166d44..6b5327f83 100644
--- a/feature/taildrop/send.go
+++ b/feature/taildrop/send.go
@@ -134,8 +134,9 @@ func (m *manager) PutFile(id clientID, baseName string, r io.Reader, offset, len
 		}
 	}
 
-	// Copy the contents of the file to the writer.
-	copyLength, err := io.Copy(wc, r)
+	// Copy via inFile (which wraps wc) so [incomingFile.Write] can track
+	// progress and fire periodic sendFileNotify callbacks.
+	copyLength, err := io.Copy(inFile, r)
 	if err != nil {
 		return 0, m.redactAndLogError("Copy", err)
 	}