add excel extension

app/Classes/Modules/Documents/Services/ConvertsBase64ToFile.php

@@ -36,7 +36,7 @@ class ConvertsBase64ToFile
         foreach ($files as $file) {
 
             $object = new FileObject($file);
-            $object->getExtension() === 'pdf' ? $this->generatePDF($object) : $this->generateImage($object);
+            in_array($object->getExtension(), ['pdf', 'excel']) ? $this->generatePDF($object) : $this->generateImage($object);
 
         }
 
@@ -122,4 +122,4 @@ class ConvertsBase64ToFile
         ]);
     }
 
-}
+}