diff --git a/.gitea/workflows/build-windows.yml b/.gitea/workflows/build-windows.yml
index 7cc6beb8c..51cf3009d 100644
--- a/.gitea/workflows/build-windows.yml
+++ b/.gitea/workflows/build-windows.yml
@@ -183,6 +183,25 @@ jobs:
             exit 1
           fi
 
+      - name: Diagnose flutter/ contents before build
+        shell: pwsh
+        run: |
+          Write-Host "== pwd =="
+          Get-Location
+          Write-Host "`n== flutter/ ==" ; Get-ChildItem .\flutter -Force | Select-Object Mode,Length,Name
+          if (Test-Path .\flutter\windows) {
+            Write-Host "`n== flutter/windows/ =="
+            Get-ChildItem .\flutter\windows -Recurse -Force | Select-Object FullName, Length
+          } else {
+            Write-Host "`n!! flutter/windows DOES NOT EXIST !!"
+          }
+          Write-Host "`n== git ls-files flutter/windows =="
+          git ls-files flutter/windows | Measure-Object -Line
+          Write-Host "`n== git status (porcelain) =="
+          git status --porcelain | Select-Object -First 30
+          Write-Host "`n== flutter doctor =="
+          flutter doctor -v
+
       - name: Build RustDesk (build.py --portable --hwcodec --flutter --vram)
         shell: pwsh
         run: |