Setting a smallThumb

Config/thumbnails.php

@@ -2,9 +2,12 @@
 
 return [
     'smallThumb' => [
-        'crop' => [
-            'width' => '100',
-            'height' => '200'
+        'fit' => [
+            'width' => 50,
+            'height' => 50,
+            'callback' => function($constraint) {
+                $constraint->upsize();
+            }
         ],
     ]
 ];