diff --git a/classifier/js/tree.js b/classifier/js/tree.js
index 6fec115..c8497d6 100644
--- a/classifier/js/tree.js
+++ b/classifier/js/tree.js
@@ -153,7 +153,10 @@
         toggle.className = 'folder-toggle';
         const mightHaveChildren = (folder.children && folder.children.length > 0)
             || folder.scanState === 'pending'
-            || folder.scanState === 'zip-pending';
+            || folder.scanState === 'zip-pending'
+            // Classify mode: a folder with files (even none of subfolders) is
+            // expandable so its files can be revealed and dragged.
+            || (classifyOn() && folder.files && folder.files.length > 0);
         if (mightHaveChildren) {
             toggle.textContent = folder.expanded ? '▼' : '▶';
             toggle.addEventListener('click', (e) => {
diff --git a/tests/classify.spec.js b/tests/classify.spec.js
index 788f548..0398b3a 100644
--- a/tests/classify.spec.js
+++ b/tests/classify.spec.js
@@ -244,6 +244,21 @@ test('source file rows render with a state dot in classify mode', async ({ page
     await expect(page.locator('#folderTree .file-item .cl-dot--none')).toBeVisible();
 });
 
+test('classify: a folder with files but no subfolders is expandable (drag source)', async ({ page }) => {
+    await page.click('#modeClassifyBtn');
+    await page.evaluate(() => {
+        window.app.folderTree = [{
+            name: 'Leaf', path: 'Leaf', expanded: false, scanState: 'done',
+            files: [{ originalFilename: 'x', extension: 'pdf', folderPath: 'Leaf' }], children: [],
+        }];
+        window.app.modules.tree.render();
+    });
+    const toggle = page.locator('#folderTree .folder-item .folder-toggle').first();
+    await expect(toggle).toHaveText('▶');          // file-only folder still gets an expand arrow
+    await toggle.click();
+    await expect(page.locator('#folderTree .file-item .file-name', { hasText: 'x.pdf' })).toBeVisible();
+});
+
 test('placing a file turns its dot (and the folder aggregate) done', async ({ page }) => {
     await withSourceTree(page);
     await page.evaluate(() => {