diff --git a/packages/reva-admin-react/src/app/(aap)/candidacies/[candidacyId]/feasibility-aap/attachments/page.tsx b/packages/reva-admin-react/src/app/(aap)/candidacies/[candidacyId]/feasibility-aap/attachments/page.tsx
index 28784c18b..310f586eb 100644
--- a/packages/reva-admin-react/src/app/(aap)/candidacies/[candidacyId]/feasibility-aap/attachments/page.tsx
+++ b/packages/reva-admin-react/src/app/(aap)/candidacies/[candidacyId]/feasibility-aap/attachments/page.tsx
@@ -17,7 +17,7 @@ import {
 } from "./_components/attachments.hook";
 
 const ACCEPTED_FILE_TYPES = ".pdf, .jpg, .jpeg, .png" as const;
-const MAX_FILE_SIZE = "2Mo" as const;
+const MAX_FILE_SIZE = "15Mo" as const;
 const hintMessage = `Formats supportés : ${ACCEPTED_FILE_TYPES} avec un poids maximum de ${MAX_FILE_SIZE}`;
 
 const schema = z
diff --git a/packages/reva-api/modules/feasibility/dematerialized-feasibility-file/features/createOrUpdateAttachments.ts b/packages/reva-api/modules/feasibility/dematerialized-feasibility-file/features/createOrUpdateAttachments.ts
index 7d28205d3..d76715b9d 100644
--- a/packages/reva-api/modules/feasibility/dematerialized-feasibility-file/features/createOrUpdateAttachments.ts
+++ b/packages/reva-api/modules/feasibility/dematerialized-feasibility-file/features/createOrUpdateAttachments.ts
@@ -15,6 +15,8 @@ import { getDematerializedFeasibilityFileWithAttachmentsByCandidacyId } from "./
 import { resetDFFSentToCandidateState } from "./resetDFFSentToCandidateState";
 import { allowFileTypeByDocumentType } from "../../../../modules/shared/file/allowFileTypes";
 
+const MAX_UPLOAD_SIZE = 15728640; // 15Mo
+
 export const createOrUpdateAttachments = async ({
   candidacyId,
   input: {
@@ -68,19 +70,6 @@ export const createOrUpdateAttachments = async ({
       existingFiles.push(...existingOtherAttachmentsFiles);
     }
 
-    if (existingFiles.length) {
-      await Promise.all(
-        existingFiles.map(({ file: { path } }) => deleteFile(path)),
-      );
-      await prismaClient.dFFAttachment.deleteMany({
-        where: {
-          id: {
-            in: existingFiles.map(({ id }) => id),
-          },
-        },
-      });
-    }
-
     const idCardFile = await getUploadedFile(idCard);
 
     const equivalenceOrExemptionProofFile = equivalenceOrExemptionProof
@@ -139,6 +128,27 @@ export const createOrUpdateAttachments = async ({
       }
     }
 
+    for (const { file } of fileAndIds) {
+      if (file._buf.length > MAX_UPLOAD_SIZE) {
+        throw new Error(
+          `Le fichier ${file.filename} est trop volumineux (${(file._buf.length / 1024 / 1024).toFixed(2)} Mo). La taille maximale autorisée est de ${MAX_UPLOAD_SIZE / 1024 / 1024} Mo.`,
+        );
+      }
+    }
+
+    if (existingFiles.length) {
+      await Promise.all(
+        existingFiles.map(({ file: { path } }) => deleteFile(path)),
+      );
+      await prismaClient.dFFAttachment.deleteMany({
+        where: {
+          id: {
+            in: existingFiles.map(({ id }) => id),
+          },
+        },
+      });
+    }
+
     for (const { file, filePath } of fileAndIds) {
       await uploadFileToS3({
         filePath,