diff --git a/.github/workflows/build_prepare.yaml b/.github/workflows/build_prepare.yaml
index 7ce54bb..9c128e5 100644
--- a/.github/workflows/build_prepare.yaml
+++ b/.github/workflows/build_prepare.yaml
@@ -69,14 +69,23 @@ jobs:
               env:
                 S3_AK: ${{ secrets.S3_AK }}
                 S3_SK: ${{ secrets.S3_SK }}
+              shell: bash
               run: |
+                # Download MinIO client
                 wget https://dl.min.io/client/mc/release/linux-amd64/mc
                 chmod +x mc
-                ./mc alias set s3 https://s3.piskot.si $S3_AK $S3_SK
+                
+                # Verify environment variables
+                if [ -z "$S3_AK" ] || [ -z "$S3_SK" ]; then
+                  echo "Error: S3 credentials not set"
+                  exit 1
+                fi
 
-            - name: Upload files to S3
-              run: |
-                ./mc cp webapp.asar s3/element-desktop/staging/
-                ./mc cp package.json s3/element-desktop/staging/
-                ./mc cp electronVersion s3/element-desktop/staging/
-                ./mc cp hakHash s3/element-desktop/staging/
+                # Set and verify alias
+                ./mc alias set s3 https://s3.piskot.si "$S3_AK" "$S3_SK"
+                if ! ./mc alias list | grep -q "s3"; then
+                  echo "Error: Failed to set S3 alias"
+                  exit 1
+                fi
+                
+                echo "Successfully configured MinIO client"