diff --git a/e2e/suites/interactions/repositories/remote-cached-artifacts.spec.ts b/e2e/suites/interactions/repositories/remote-cached-artifacts.spec.ts
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+++ b/e2e/suites/interactions/repositories/remote-cached-artifacts.spec.ts
@@ -0,0 +1,115 @@
+import { test, expect } from '@playwright/test';
+
+/**
+ * Regression test for issue #424 — "Artifacts no longer show in UI".
+ *
+ * When a remote (proxy) repository pulls a package through to its upstream,
+ * the cached object must appear in the repository artifact listing so it can
+ * be browsed and scanned. The v1.2.0 regression (backend #1278 / #1280)
+ * stopped recording proxy-cached items in the `artifacts` table to fix a
+ * filesystem storage-path bug; the side effect was that remote-cached items
+ * vanished from:
+ *
+ *   GET /api/v1/repositories/{key}/artifacts
+ *
+ * and therefore from the repo browser UI, even though the bytes were written
+ * to storage. The backend now reconstructs the listing for remote repos from
+ * the proxy cache (backend #1548), so this verifies the user-visible flow:
+ * pull a package through the seeded NPM remote, then confirm it shows up in
+ * both the listing API and the Artifacts tab of the repo detail page.
+ *
+ * Uses the seeded `e2e-npm-remote` repository (proxies registry.npmjs.org,
+ * see e2e/setup/seed-data.ts). The NPM proxy routes are mounted at
+ * `/npm/{repo_key}/...`; fetching package metadata caches an entry under the
+ * package path, which the listing surfaces with `path === <package>`.
+ */
+test.describe('Remote repository cached artifacts (#424)', () => {
+  const REPO_KEY = 'e2e-npm-remote';
+  // A tiny, stable package with no dependencies — cheap to pull through.
+  const PACKAGE = 'is-odd';
+
+  /**
+   * Pull a package through the NPM proxy so the backend caches it. Returns
+   * true once the proxy responds successfully; remote upstream hiccups should
+   * skip the test rather than fail it (the listing behavior, not upstream
+   * availability, is under test).
+   */
+  async function pullThroughProxy(
+    request: import('@playwright/test').APIRequestContext
+  ): Promise<boolean> {
+    const resp = await request.get(`/npm/${REPO_KEY}/${PACKAGE}`);
+    return resp.ok();
+  }
+
+  test('proxy-cached package appears in the artifact listing API', async ({ request }) => {
+    const pulled = await pullThroughProxy(request);
+    if (!pulled) {
+      test.skip(true, 'Upstream NPM registry unavailable; cannot exercise pull-through');
+      return;
+    }
+
+    const listResp = await request.get(
+      `/api/v1/repositories/${REPO_KEY}/artifacts?per_page=100`
+    );
+    expect(listResp.ok(), `Listing failed: ${listResp.status()}`).toBeTruthy();
+
+    const body = await listResp.json();
+    expect(Array.isArray(body.items), 'listing has an items array').toBeTruthy();
+
+    // The regression manifested as an empty listing despite storage filling
+    // up. After the fix the pulled package must be present.
+    expect(
+      body.items.length,
+      'remote repo listing must not be empty after a pull-through'
+    ).toBeGreaterThan(0);
+
+    const match = body.items.find(
+      (item: { path?: string; name?: string }) =>
+        (item.path ?? '').includes(PACKAGE) || (item.name ?? '').includes(PACKAGE)
+    );
+    expect(
+      match,
+      `pulled package "${PACKAGE}" should be listed in the remote repo`
+    ).toBeTruthy();
+    // The cached entry carries real metadata reconstructed from the sidecar.
+    expect(match.size_bytes, 'cached entry reports a size').toBeGreaterThan(0);
+    expect(match.checksum_sha256, 'cached entry reports a checksum').toBeTruthy();
+  });
+
+  test('proxy-cached package shows in the repo browser Artifacts tab', async ({
+    page,
+    request,
+  }) => {
+    const pulled = await pullThroughProxy(request);
+    if (!pulled) {
+      test.skip(true, 'Upstream NPM registry unavailable; cannot exercise pull-through');
+      return;
+    }
+
+    await page.goto(`/repositories/${REPO_KEY}`);
+    await page.waitForLoadState('domcontentloaded');
+
+    // The Artifacts tab is the flat-list browser fed by the listing endpoint.
+    const artifactsTab = page.getByRole('tab', { name: /artifacts/i }).first();
+    if (await artifactsTab.isVisible({ timeout: 5000 }).catch(() => false)) {
+      await artifactsTab.click();
+    }
+
+    const table = page.getByRole('table').first();
+    await expect(table).toBeVisible({ timeout: 15000 });
+
+    // Narrow the table to the package we pulled. The search input filters the
+    // listing server-side (maps to the `q` parameter).
+    const searchInput = page.getByPlaceholder(/search/i).first();
+    if (await searchInput.isVisible({ timeout: 3000 }).catch(() => false)) {
+      await searchInput.fill(PACKAGE);
+      await page.waitForTimeout(2000);
+    }
+
+    const artifactRow = table.getByRole('row').filter({ hasText: PACKAGE });
+    await expect(
+      artifactRow.first(),
+      `cached package "${PACKAGE}" should be a row in the Artifacts tab`
+    ).toBeVisible({ timeout: 10000 });
+  });
+});