Working s3 compatible file uplaods!

assets/js/upload.ts

@@ -0,0 +1,29 @@
+export interface UploadResult {
+  success: true;
+  mediaId: string;
+  url: string;
+}
+
+export interface UploadError {
+  success?: false;
+  error: string;
+}
+
+export async function uploadFile(
+  file: File,
+  csrfToken: string
+): Promise<UploadResult | UploadError> {
+  const formData = new FormData();
+  formData.append("file", file);
+  // Do NOT set Content-Type — browser sets the multipart boundary automatically
+  const res = await fetch("/upload", {
+    method: "POST",
+    headers: { "X-CSRF-Token": csrfToken },
+    body: formData,
+  });
+  const json = await res.json();
+  if (!res.ok || !json.success) {
+    return { error: json.error ?? "Upload failed" };
+  }
+  return json as UploadResult;
+}