diff --git a/.manus/db/db-query-1767974417009.json b/.manus/db/db-query-1767974417009.json
new file mode 100644
index 0000000..d8892c6
--- /dev/null
+++ b/.manus/db/db-query-1767974417009.json
@@ -0,0 +1,28 @@
+{
+  "query": "SELECT id, fileName, fileUrl, fileKey FROM sourceFiles ORDER BY createdAt DESC LIMIT 5;",
+  "command": "mysql --batch --raw --column-names --default-character-set=utf8mb4 --host gateway02.us-east-1.prod.aws.tidbcloud.com --port 4000 --user 4CrrYuB5tme73Qo.bd4328423008 --database fo4DRyBgjsuiigFAgNLuWm --execute SELECT id, fileName, fileUrl, fileKey FROM sourceFiles ORDER BY createdAt DESC LIMIT 5;",
+  "rows": [
+    {
+      "id": "60001",
+      "fileName": "FACTURES FOURNISSEURS.pdf",
+      "fileUrl": "/storage/2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf",
+      "fileKey": "2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf"
+    },
+    {
+      "id": "30001",
+      "fileName": "FACTURES FOURNISSEURS.pdf",
+      "fileUrl": "/storage/2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf",
+      "fileKey": "2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf"
+    },
+    {
+      "id": "1",
+      "fileName": "FACTURES FOURNISSEURS.pdf",
+      "fileUrl": "/storage/2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf",
+      "fileKey": "2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf"
+    }
+  ],
+  "messages": [],
+  "stdout": "id\tfileName\tfileUrl\tfileKey\n60001\tFACTURES FOURNISSEURS.pdf\t/storage/2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf\t2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf\n30001\tFACTURES FOURNISSEURS.pdf\t/storage/2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf\t2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf\n1\tFACTURES FOURNISSEURS.pdf\t/storage/2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf\t2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf\n",
+  "stderr": "",
+  "execution_time_ms": 56
+}
\ No newline at end of file
diff --git a/.manus/db/db-query-1767975963635.json b/.manus/db/db-query-1767975963635.json
new file mode 100644
index 0000000..ab7ca5f
--- /dev/null
+++ b/.manus/db/db-query-1767975963635.json
@@ -0,0 +1,31 @@
+{
+  "query": "SELECT id, fileName, fileKey, fileUrl, processingStatus FROM sourceFiles ORDER BY createdAt DESC LIMIT 3;",
+  "command": "mysql --batch --raw --column-names --default-character-set=utf8mb4 --host gateway02.us-east-1.prod.aws.tidbcloud.com --port 4000 --user 4CrrYuB5tme73Qo.bd4328423008 --database fo4DRyBgjsuiigFAgNLuWm --execute SELECT id, fileName, fileKey, fileUrl, processingStatus FROM sourceFiles ORDER BY createdAt DESC LIMIT 3;",
+  "rows": [
+    {
+      "id": "60001",
+      "fileName": "FACTURES FOURNISSEURS.pdf",
+      "fileKey": "2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf",
+      "fileUrl": "/storage/2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf",
+      "processingStatus": "completed"
+    },
+    {
+      "id": "30001",
+      "fileName": "FACTURES FOURNISSEURS.pdf",
+      "fileKey": "2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf",
+      "fileUrl": "/storage/2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf",
+      "processingStatus": "completed"
+    },
+    {
+      "id": "1",
+      "fileName": "FACTURES FOURNISSEURS.pdf",
+      "fileKey": "2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf",
+      "fileUrl": "/storage/2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf",
+      "processingStatus": "completed"
+    }
+  ],
+  "messages": [],
+  "stdout": "id\tfileName\tfileKey\tfileUrl\tprocessingStatus\n60001\tFACTURES FOURNISSEURS.pdf\t2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf\t/storage/2026-01/1-fmxuQN06-FACTURES FOURNISSEURS.pdf\tcompleted\n30001\tFACTURES FOURNISSEURS.pdf\t2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf\t/storage/2026-01/1-0n3DLF9m-FACTURES FOURNISSEURS.pdf\tcompleted\n1\tFACTURES FOURNISSEURS.pdf\t2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf\t/storage/2026-01/1-FSrFmQSC-FACTURES FOURNISSEURS.pdf\tcompleted\n",
+  "stderr": "",
+  "execution_time_ms": 48
+}
\ No newline at end of file
diff --git a/client/src/pages/InvoiceDetail.tsx b/client/src/pages/InvoiceDetail.tsx
index 462df76..3022678 100644
--- a/client/src/pages/InvoiceDetail.tsx
+++ b/client/src/pages/InvoiceDetail.tsx
@@ -1,4 +1,4 @@
-import { useState } from "react";
+import { useState, useEffect } from "react";
 import { useParams, useLocation } from "wouter";
 import DashboardLayout from "@/components/DashboardLayout";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
@@ -29,7 +29,7 @@ export default function InvoiceDetail() {
   });
 
   // Initialize form data when invoice loads
-  useState(() => {
+  useEffect(() => {
     if (invoice) {
       setFormData({
         supplierName: invoice.supplierName || "",
@@ -42,7 +42,7 @@ export default function InvoiceDetail() {
         totalAmount: invoice.totalAmount ? invoice.totalAmount.toString() : "",
       });
     }
-  });
+  }, [invoice]);
 
   const updateMutation = trpc.invoices.update.useMutation({
     onSuccess: () => {
diff --git a/server/routers.ts b/server/routers.ts
index 67623ba..82c6921 100644
--- a/server/routers.ts
+++ b/server/routers.ts
@@ -109,10 +109,21 @@ export const appRouter = router({
         
         // Decode base64 file data
         const fileBuffer = Buffer.from(input.fileData, "base64");
+        console.log(`[Upload] Received file: ${input.fileName}, size: ${fileBuffer.length} bytes`);
         
         // Store source file
         const sourceFileKey = generateStorageKey(userId, input.fileName);
-        const { url: sourceFileUrl } = await localStoragePut(sourceFileKey, fileBuffer, "application/pdf");
+        console.log(`[Upload] Generated storage key: ${sourceFileKey}`);
+        
+        try {
+          const { url: sourceFileUrl } = await localStoragePut(sourceFileKey, fileBuffer, "application/pdf");
+          console.log(`[Upload] File stored successfully at: ${sourceFileUrl}`);
+        } catch (error) {
+          console.error(`[Upload] FAILED to store file:`, error);
+          throw error;
+        }
+        
+        const sourceFileUrl = `/storage/${sourceFileKey}`;
         
         // Create source file record
         const sourceFile = await createSourceFile({
diff --git a/storage/test/test-file.pdf b/storage/test/test-file.pdf
new file mode 100644
index 0000000..a812de2
--- /dev/null
+++ b/storage/test/test-file.pdf
@@ -0,0 +1 @@
+Test PDF content
\ No newline at end of file
diff --git a/test-storage.mjs b/test-storage.mjs
new file mode 100644
index 0000000..5041184
--- /dev/null
+++ b/test-storage.mjs
@@ -0,0 +1,16 @@
+import { localStoragePut } from "./server/localStorage.ts";
+
+const testBuffer = Buffer.from("Test PDF content");
+const result = await localStoragePut("test/test-file.pdf", testBuffer, "application/pdf");
+console.log("Storage test result:", result);
+
+// Check if file exists
+import fs from "fs/promises";
+import path from "path";
+const fullPath = path.join(process.cwd(), "storage", "test/test-file.pdf");
+try {
+  await fs.access(fullPath);
+  console.log("✓ File exists at:", fullPath);
+} catch {
+  console.log("✗ File does NOT exist at:", fullPath);
+}
diff --git a/todo.md b/todo.md
index ea60297..14e9792 100644
--- a/todo.md
+++ b/todo.md
@@ -115,3 +115,13 @@
 - [x] Séparer la logique de sélection pour export et suppression
 - [x] Supprimer les restrictions disabled sur les checkboxes
 - [x] Ajouter validation pour export PDF (seulement score 100%)
+
+## Diagnostic problème 404 persistant
+- [ ] Vérifier si les fichiers sont stockés dans le dossier storage
+- [ ] Vérifier les URLs générées dans la base de données
+- [ ] Vérifier la configuration Express pour servir les fichiers statiques
+- [ ] Corriger le chemin d'accès aux fichiers PDF
+
+## Correction formulaire d'édition
+- [x] Pré-remplir les valeurs existantes dans le formulaire d'édition de facture
+- [x] Utiliser useEffect pour initialiser les valeurs du formulaire