diff --git a/archive/js/app.js b/archive/js/app.js
index e7500de..920b8cf 100644
--- a/archive/js/app.js
+++ b/archive/js/app.js
@@ -74,14 +74,39 @@
     }
 
     // Auto-connect to the HTTP server
-    // Derives the base URL from the current page's location
+    // Derives the base URL from the current page's location.
+    //
+    // Two URL shapes can serve the archive tool:
+    //   (a) Filename-style:   /Project-1/Archive/PartyA/archive.html
+    //   (b) Auto-served:      /Project-1/Archive/PartyA/Issued
+    //
+    // For (a) the URL ends with a filename (`*.html`) and the
+    // archive's scan root is the parent directory. For (b) the URL
+    // path IS the directory; trying to strip the last segment would
+    // wrongly scan the parent. Detect (b) by checking whether the
+    // path's last segment looks like a file (has a dot + extension).
     async function autoConnectHttpSource() {
         var href = window.location.href;
         // Strip query string and fragment
         href = href.split('?')[0].split('#')[0];
-        // Strip the filename to get the directory
-        var lastSlash = href.lastIndexOf('/');
-        var baseUrl = (lastSlash >= 0) ? href.substring(0, lastSlash + 1) : href + '/';
+        var baseUrl;
+        if (href.endsWith('/')) {
+            // Directory URL, e.g. /Project-1/archive/ or /
+            baseUrl = href;
+        } else {
+            var lastSlash = href.lastIndexOf('/');
+            var lastSegment = lastSlash >= 0 ? href.substring(lastSlash + 1) : href;
+            // A "filename" has a dot in its last segment. A bare
+            // directory name (e.g. "Issued") doesn't. Don't be fooled
+            // by dots in domain names — lastSlash is past the host.
+            if (lastSegment.indexOf('.') >= 0) {
+                baseUrl = href.substring(0, lastSlash + 1);
+            } else {
+                // Auto-served at a directory URL with no trailing
+                // slash. Treat the whole path as the scan root.
+                baseUrl = href + '/';
+            }
+        }
 
         // Multi-project mode is opt-in via ?projects= in the URL.
         //   ?projects= absent       → not multi-project; scan whatever the URL