diff --git a/packages/playwright-core/src/utils/traceUtils.ts b/packages/playwright-core/src/utils/traceUtils.ts
index b39d7c9998..e6ca9de7b7 100644
--- a/packages/playwright-core/src/utils/traceUtils.ts
+++ b/packages/playwright-core/src/utils/traceUtils.ts
@@ -116,16 +116,24 @@ export async function saveTraceFile(fileName: string, traceEvents: TraceEvent[],
 
   const sha1s = new Set<string>();
   for (const event of traceEvents.filter(e => e.type === 'after') as AfterActionTraceEvent[]) {
-    for (const attachment of (event.attachments || []).filter(a => !!a.path)) {
-      await fs.promises.readFile(attachment.path!).then(content => {
-        const sha1 = calculateSha1(content);
-        attachment.sha1 = sha1;
-        delete attachment.path;
-        if (sha1s.has(sha1))
-          return;
-        sha1s.add(sha1);
-        zipFile.addBuffer(content, 'resources/' + sha1);
-      }).catch();
+    for (const attachment of (event.attachments || [])) {
+      let contentPromise: Promise<Buffer> | undefined;
+      if (attachment.path)
+        contentPromise = fs.promises.readFile(attachment.path);
+      else if (attachment.base64)
+        contentPromise = Promise.resolve(Buffer.from(attachment.base64, 'base64'));
+      if (!contentPromise)
+        continue;
+
+      const content = await contentPromise;
+      const sha1 = calculateSha1(content);
+      attachment.sha1 = sha1;
+      delete attachment.path;
+      delete attachment.base64;
+      if (sha1s.has(sha1))
+        continue;
+      sha1s.add(sha1);
+      zipFile.addBuffer(content, 'resources/' + sha1);
     }
   }
 
diff --git a/packages/playwright-test/src/worker/testInfo.ts b/packages/playwright-test/src/worker/testInfo.ts
index 110657222a..dbb0d53747 100644
--- a/packages/playwright-test/src/worker/testInfo.ts
+++ b/packages/playwright-test/src/worker/testInfo.ts
@@ -332,7 +332,7 @@ export class TestInfoImpl implements TestInfo {
 
   async attach(name: string, options: { path?: string, body?: string | Buffer, contentType?: string } = {}) {
     const step = this._addStep({
-      title: 'attach',
+      title: `attach  "${name}"`,
       category: 'attach',
       wallTime: Date.now(),
     });
@@ -404,7 +404,7 @@ function serializeAttachments(attachments: TestInfo['attachments'], initialAttac
       name: a.name,
       contentType: a.contentType,
       path: a.path,
-      body: a.body?.toString('base64'),
+      base64: a.body?.toString('base64'),
     };
   });
 }
diff --git a/packages/trace/src/trace.ts b/packages/trace/src/trace.ts
index c70734d93c..0348281ff6 100644
--- a/packages/trace/src/trace.ts
+++ b/packages/trace/src/trace.ts
@@ -85,7 +85,7 @@ export type AfterActionTraceEvent = {
     contentType: string;
     path?: string;
     sha1?: string;
-    body?: string;  // base64
+    base64?: string;
   }[];
   result?: any;
 };
diff --git a/tests/playwright-test/ui-mode-test-attachments.spec.ts b/tests/playwright-test/ui-mode-test-attachments.spec.ts
index d4dcfa45da..b6cceb0d5f 100644
--- a/tests/playwright-test/ui-mode-test-attachments.spec.ts
+++ b/tests/playwright-test/ui-mode-test-attachments.spec.ts
@@ -16,9 +16,7 @@
 
 import { test, expect } from './ui-mode-fixtures';
 
-test.describe.configure({ mode: 'parallel' });
-
-test('should contain attachments', async ({ runUITest }) => {
+test('should contain file attachment', async ({ runUITest }) => {
   const { page } = await runUITest({
     'a.test.ts': `
       import { test } from '@playwright/test';
@@ -31,7 +29,7 @@ test('should contain attachments', async ({ runUITest }) => {
   await page.getByTitle('Run all').click();
   await expect(page.getByTestId('status-line')).toHaveText('1/1 passed (100%)');
   await page.getByText('Attachments').click();
-  await page.getByText('attach', { exact: true }).click();
+  await page.getByText('attach "note"', { exact: true }).click();
   const popupPromise = page.waitForEvent('popup');
   await page.getByRole('link', { name: 'note' }).click();
   const popup = await popupPromise;
@@ -39,3 +37,25 @@ test('should contain attachments', async ({ runUITest }) => {
   const content = await popup.content();
   expect(content).toContain('attach test');
 });
+
+test('should contain string attachment', async ({ runUITest }) => {
+  const { page } = await runUITest({
+    'a.test.ts': `
+      import { test } from '@playwright/test';
+      test('attach test', async () => {
+        await test.info().attach('note', { body: 'text42' });
+      });
+    `,
+  });
+  await page.getByText('attach test').click();
+  await page.getByTitle('Run all').click();
+  await expect(page.getByTestId('status-line')).toHaveText('1/1 passed (100%)');
+  await page.getByText('Attachments').click();
+  await page.getByText('attach "note"', { exact: true }).click();
+  const popupPromise = page.waitForEvent('popup');
+  await page.getByRole('link', { name: 'note' }).click();
+  const popup = await popupPromise;
+  await popup.waitForLoadState();
+  const content = await popup.content();
+  expect(content).toContain('text42');
+});