diff --git a/.github/workflows/test-browser.yml b/.github/workflows/test-browser.yml
index c434c2e58..a136e3f2a 100644
--- a/.github/workflows/test-browser.yml
+++ b/.github/workflows/test-browser.yml
@@ -30,6 +30,11 @@ jobs:
       - env:
           PLAYWRIGHT_BROWSER: ${{ matrix.browser }}
         run: npm run test:playwright
+      - name: Save private API usage data
+        uses: actions/upload-artifact@v4
+        with:
+          name: private-api-usage
+          path: private-api-usage
       - name: Upload test results
         if: always()
         uses: ably/test-observability-action@v1
diff --git a/.github/workflows/test-node.yml b/.github/workflows/test-node.yml
index 39ccf4d0e..8f1fc1b4e 100644
--- a/.github/workflows/test-node.yml
+++ b/.github/workflows/test-node.yml
@@ -28,6 +28,11 @@ jobs:
       - run: npm run test:node
         env:
           CI: true
+      - name: Save private API usage data
+        uses: actions/upload-artifact@v4
+        with:
+          name: private-api-usage
+          path: private-api-usage
       - name: Upload test results
         if: always()
         uses: ably/test-observability-action@v1