diff --git a/lib/content-services/upload/components/file-uploading-dialog.component.html b/lib/content-services/upload/components/file-uploading-dialog.component.html
index 586d93bdfa..ec47771ab4 100644
--- a/lib/content-services/upload/components/file-uploading-dialog.component.html
+++ b/lib/content-services/upload/components/file-uploading-dialog.component.html
@@ -7,6 +7,7 @@
             mat-button
             color="secondary"
             [disabled]="isConfirmation"
+            [attr.aria-expanded]="!isDialogMinimized"
             (click)="toggleMinimized()">
             <mat-icon
                 mat-list-icon