mock server, file and folder management

.env.example

@@ -33,6 +33,16 @@ S3_SECRET_ACCESS_KEY=multimailer-dev-secret-change-me
 GARAGE_S3_PORT=3900
 GARAGE_ADMIN_PORT=3903
 
+# Managed file storage. Development uses the local filesystem; production can
+# use FILE_STORAGE_BACKEND=s3 with Garage-compatible credentials.
+FILE_STORAGE_BACKEND=local
+FILE_STORAGE_LOCAL_ROOT=runtime/files
+FILE_STORAGE_S3_ENDPOINT_URL=http://garage:3900
+FILE_STORAGE_S3_REGION=garage
+FILE_STORAGE_S3_BUCKET=files
+FILE_STORAGE_S3_ACCESS_KEY_ID=GKmultimailerdev0000000000000000
+FILE_STORAGE_S3_SECRET_ACCESS_KEY=multimailer-dev-secret-change-me
+
 # Crypto: required before storing real SMTP/IMAP credentials.
 # Generate:
 #   python -c "import os,base64; print(base64.b64encode(os.urandom(32)).decode())"