diff --git a/atlas/templates/atlas/series_form.html b/atlas/templates/atlas/series_form.html
index 8b335b63..0f0f071c 100755
--- a/atlas/templates/atlas/series_form.html
+++ b/atlas/templates/atlas/series_form.html
@@ -199,7 +199,7 @@
                 return new Promise((resolve, reject) => {
                     const fileReader = new FileReader();
                     fileReader.onload = () => resolve(fileReader);
-                    fileReader.readAsDataURL(file);
+                    fileReader.readAsArrayBuffer(file);
                 });
             }