diff --git a/web/app.js b/web/app.js
index 8f70f532f..90c492dfd 100644
--- a/web/app.js
+++ b/web/app.js
@@ -2185,7 +2185,8 @@ function webViewerInitialized() {
     appConfig.mainContainer.addEventListener("dragover", function (evt) {
       evt.preventDefault();
 
-      evt.dataTransfer.dropEffect = "move";
+      evt.dataTransfer.dropEffect =
+        evt.dataTransfer.effectAllowed === "copy" ? "copy" : "move";
     });
     appConfig.mainContainer.addEventListener("drop", function (evt) {
       evt.preventDefault();