Convert to array if string value is provided

Author: Baspa

src/Media.php

@@ -74,10 +74,14 @@ public static function mutateFormDataCallback(Model $record, Field $field, array
             return $data;
         }
 
-        $media = MediaModel::whereIn('ulid', $record->values[$field->slug])
+        $values = is_array($record->values[$field->slug])
+            ? $record->values[$field->slug]
+            : [$record->values[$field->slug]];
+
+        $media = MediaModel::whereIn('ulid', $values)
             ->get()
             ->map(function ($media) {
-                return 'media/'.$media->filename;
+                return 'media/' . $media->filename;
             })->toArray();
 
         $data['value'][$field->slug] = $media;
@@ -103,4 +107,4 @@ public static function mutateBeforeSaveCallback(Model $record, Field $field, arr
 
         return $data;
     }
-}
+}