diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 2f516db..43f17bd 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -7,6 +7,28 @@ import { toast } from 'sonner';
 import { getSupportedExtension, convertToGLB, ACCEPTED_EXTENSIONS } from '@/lib/convertToGLB';
 import { convertIFCtoGLB } from '@/lib/convertIFC';
 
+/**
+ * Normaliza URLs comuns para apontar ao binário direto.
+ * - Dropbox: força dl=1
+ * - OneDrive (1drv.ms / onedrive.live.com): força download=1
+ */
+function normalizeCloudUrl(input: string): string {
+  try {
+    const u = new URL(input);
+    if (/(^|\.)dropbox\.com$/.test(u.hostname)) {
+      u.searchParams.set('dl', '1');
+      return u.toString();
+    }
+    if (/(^|\.)1drv\.ms$|onedrive\.live\.com$/.test(u.hostname)) {
+      u.searchParams.set('download', '1');
+      return u.toString();
+    }
+    return input;
+  } catch {
+    return input;
+  }
+}
+
 const Index = () => {
   const navigate = useNavigate();
   const fileInputRef = useRef<HTMLInputElement>(null);
@@ -63,18 +85,47 @@ const Index = () => {
   }, [setModel]);
 
   const handleLoadCloud = useCallback(async () => {
-    const url = window.prompt('URL do modelo (GLB · OBJ · STL · IFC):', 'https://');
-    if (!url) return;
+    const DEFAULT_URL = 'https://store.tracksteel.com.br/demo.ifc';
+    const raw = window.prompt(
+      'URL do modelo (GLB · OBJ · STL · IFC).\nDica: Dropbox use ?dl=1 · OneDrive ?download=1 · FileBrowser /api/raw/<arquivo>',
+      DEFAULT_URL,
+    );
+    if (!raw) return;
     setLoadingCloud(true);
     try {
+      // Normalizações automáticas para hosts comuns
+      const url = normalizeCloudUrl(raw.trim());
       const fileName = url.split('/').pop()?.split('?')[0] || 'modelo-cloud';
       const ext = getSupportedExtension(fileName);
       if (!ext) {
         toast.error('URL deve apontar para .GLB, .OBJ, .STL ou .IFC');
         return;
       }
-      const response = await fetch(url, { mode: 'cors' });
+
+      let response = await fetch(url, { mode: 'cors' });
       if (!response.ok) throw new Error(`HTTP ${response.status}`);
+
+      // Detecta servidores que retornam HTML em vez do binário (ex.: FileBrowser SPA)
+      let ct = response.headers.get('content-type') || '';
+      if (ct.includes('text/html')) {
+        // Fallback: tenta endpoint /api/raw/ do FileBrowser
+        try {
+          const u = new URL(url);
+          if (!u.pathname.startsWith('/api/raw/')) {
+            const fbUrl = `${u.origin}/api/raw${u.pathname}${u.search}`;
+            const r2 = await fetch(fbUrl, { mode: 'cors' });
+            if (r2.ok) {
+              response = r2;
+              ct = r2.headers.get('content-type') || '';
+            }
+          }
+        } catch {}
+      }
+      if (ct.includes('text/html')) {
+        toast.error('O servidor devolveu uma página HTML, não o arquivo. Use o link DIRETO do arquivo (ex.: FileBrowser → /api/raw/arquivo.ifc).');
+        return;
+      }
+
       const buffer = await response.arrayBuffer();
 
       let blob: Blob;