diff --git a/apps/red-ui/src/app/app.module.ts b/apps/red-ui/src/app/app.module.ts
index b08fc3adb..c03e2dc52 100644
--- a/apps/red-ui/src/app/app.module.ts
+++ b/apps/red-ui/src/app/app.module.ts
@@ -137,7 +137,7 @@ export const appModuleFactory = (config: AppConfig) => {
                                 enabled: false,
                             },
                             PDF: {
-                                enabled: false,
+                                enabled: true,
                             },
                             FILE: {
                                 enabled: false,
diff --git a/apps/red-ui/src/app/modules/pdf-viewer/services/document-viewer.service.ts b/apps/red-ui/src/app/modules/pdf-viewer/services/document-viewer.service.ts
index d67cd1a41..06cf2e0ec 100644
--- a/apps/red-ui/src/app/modules/pdf-viewer/services/document-viewer.service.ts
+++ b/apps/red-ui/src/app/modules/pdf-viewer/services/document-viewer.service.ts
@@ -47,6 +47,7 @@ export class REDDocumentViewer {
         const toBool$ = event$.pipe(map(() => true));
 
         return toBool$.pipe(
+            tap(() => this.#flattenAnnotations()),
             tap(() => this.#setCurrentPage()),
             tap(() => this.#setInitialDisplayMode()),
             tap(() => this.updateTooltipsVisibility()),
@@ -161,6 +162,11 @@ export class REDDocumentViewer {
         }
     }
 
+    async #flattenAnnotations() {
+        const pdfDoc = await this.#document.getDocument().getPDFDoc();
+        await pdfDoc.flattenAnnotations(false);
+    }
+
     #disableTextPopupIfCompareMode(pageNumber) {
         if (this.#pdf.isCompare && pageNumber % 2 === 0) {
             return this.#pdf.disable('textPopup');
diff --git a/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts b/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
index 0d4707d9b..2edfcd868 100644
--- a/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
+++ b/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
@@ -175,12 +175,12 @@ export class PdfViewer {
             actionOnError?.();
         };
 
-        const document = await this.PDFNet.PDFDoc.createFromBuffer(await blob.arrayBuffer());
-        await document.flattenAnnotations(false);
         this.fileId = file.fileId;
         this.dossierId = file.dossierId;
 
-        this.#instance.UI.loadDocument(document, { filename: file?.filename + '.pdf' ?? 'document.pdf', onError });
+        this._logger.info('[PDF] Loading document...');
+
+        this.#instance.UI.loadDocument(blob, { documentId: file.fileId, filename: file?.filename ?? 'document.pdf', onError });
     }
 
     quad(x1: number, y1: number, x2: number, y2: number, x3: number, y3: number, x4: number, y4: number) {