diff --git a/deploy-chunked-simple.sh b/deploy-chunked-simple.sh
index 29e5c0e..1356181 100644
--- a/deploy-chunked-simple.sh
+++ b/deploy-chunked-simple.sh
@@ -211,14 +211,19 @@ upload_file_in_chunks() {
       echo "DEBUG: Uploading chunk to: $API_BASE/upload/chunk?uploadSessionId=$SESSION_ID&fileType=$file_type&chunkIndex=$chunk_index&totalChunks=$total_chunks&fileName=$file_name"
     fi
 
-    # Base64 encode the chunk so Java proxy can handle it as text/String
+    # Base64 encode the chunk to a temp file so Java proxy can handle it as text/String
     # This prevents corruption when proxy reads binary data as String
-    CHUNK_BASE64=$(base64 < "$chunk_file")
+    # Use temp file to avoid "Argument list too long" error
+    CHUNK_BASE64_FILE=$(mktemp)
+    base64 < "$chunk_file" > "$CHUNK_BASE64_FILE"
 
     RESPONSE=$(curl -s -X POST "$API_BASE/upload/chunk?uploadSessionId=$SESSION_ID&fileType=$file_type&chunkIndex=$chunk_index&totalChunks=$total_chunks&fileName=$file_name" \
       -H "Content-Type: text/plain" \
       -H "X-Chunk-Encoding: base64" \
-      -d "$CHUNK_BASE64")
+      -d @"$CHUNK_BASE64_FILE")
+
+    # Clean up temp file
+    rm -f "$CHUNK_BASE64_FILE"
 
     if [ "$DEBUG_MODE" = "true" ]; then
       echo "DEBUG: Chunk response: $RESPONSE"