only picture uploads

app/uploaders/picture_uploader.rb

@@ -31,12 +31,10 @@ class PictureUploader < CarrierWave::Uploader::Base
   #   process resize_to_fit: [50, 50]
   # end
 
-  # Add an allowlist of extensions which are allowed to be uploaded.
-  # For images you might use something like this:
-  # def extension_allowlist
-  #   %w(jpg jpeg gif png)
-  # end
-
+  def content_type_allowlist
+    /image\//
+  end
+  
   # Override the filename of the uploaded files:
   # Avoid using model.id or version_name here, see uploader/store.rb for details.
   # def filename