try this

.github/workflows/build.yml

@@ -49,7 +49,7 @@ jobs:
     - name: Upload Artifacts
       uses: actions/upload-artifact@v4
       with:
-        name: site
+        name: site-${{ matrix.runs-on }}
         path: docfx/_site
 
   #the github-pages-deploy-action needs to run on ubuntu, so use upload/download artifact to generate on windows and publish on ubuntu
@@ -68,13 +68,14 @@ jobs:
     - name: Download Artifacts
       uses: actions/download-artifact@v4
       with:
-        name: site
+        path: site
+        pattern: site-*
     # publish the generated docs into the /docs folder on a new commit in this branch
     - name: Publish DocFX to GitHub Pages
       uses: JamesIves/github-pages-deploy-action@4.1.4
       with:
         branch: ${{ steps.extract_branch.outputs.branch }}
-        folder: site #use the downloaded artifact name here
+        folder: site #use the downloaded artifact path here
         target-folder: docs
         git-config-name: Continuous Integration
         git-config-email: devs@sovren.com