Array not working. (Single works)

[robertocropper]

//-----Back-end----//

const multer = require("multer"); const upload = multer({ dest: "./uploads" });

router.post("/create", upload.array("selectedFile", 4), createProject);

//-----Front-end Function----// async function handlePublish() { try { setLoading(true); const form = new FormData(); form.append("selectedFile", selectedFile); axios.post(/api/user/create, form, { headers: { type: "multipart/form-data", }, }); console.log(form); } catch (error) { console.log(error); } finally { setLoading(false); } }