Update index.js

index.js

@@ -30,7 +30,7 @@ const BASE_URL   = process.env.BASE_URL   || `http://localhost:${PORT}`;
 // ─── CONSTANTS ────────────────────────────────────────────────────────────────
 const TG_MAX_SIZE    = 1.9  * 1024 * 1024 * 1024; // 1.9 GB per TG document
 const PART_SIZE      = 512  * 1024;                // 512 KB TG part
-const PIECE_SIZE     = 1.9 * 1024 * 1024 * 1024;         // 20 MB per upload piece
+const PIECE_SIZE     = 20   * 1024 * 1024;         // 20 MB per upload piece
 const ALIGN          = 4    * 1024;
 const DL_PART        = 512  * 1024;