diff --git a/app/models/media_attachment.rb b/app/models/media_attachment.rb
index 30d9a9851..05be302af 100644
--- a/app/models/media_attachment.rb
+++ b/app/models/media_attachment.rb
@@ -26,14 +26,14 @@ class MediaAttachment < ApplicationRecord
 
   enum type: [:image, :gifv, :video, :unknown, :audio]
 
-  IMAGE_FILE_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.gif', '.webp'].freeze
-  VIDEO_FILE_EXTENSIONS = ['.webm', '.mp4', '.m4v', '.mov'].freeze
-  AUDIO_FILE_EXTENSIONS = ['.ogg', '.oga', '.mp3', '.wav', '.flac', '.opus'].freeze
+  IMAGE_FILE_EXTENSIONS = %w(.jpg .jpeg .png .gif .webp).freeze
+  VIDEO_FILE_EXTENSIONS = %w(.webm .mp4 .m4v .mov).freeze
+  AUDIO_FILE_EXTENSIONS = %w(.ogg .oga .mp3 .wav .flac .opus .aac .m4a .3gp).freeze
 
-  IMAGE_MIME_TYPES             = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
-  VIDEO_MIME_TYPES             = ['video/webm', 'video/mp4', 'video/quicktime', 'video/ogg'].freeze
-  VIDEO_CONVERTIBLE_MIME_TYPES = ['video/webm', 'video/quicktime'].freeze
-  AUDIO_MIME_TYPES             = ['audio/wave', 'audio/wav', 'audio/x-wav', 'audio/x-pn-wave', 'audio/ogg', 'audio/mpeg', 'audio/mp3', 'audio/webm', 'audio/flac'].freeze
+  IMAGE_MIME_TYPES             = %w(image/jpeg image/png image/gif image/webp).freeze
+  VIDEO_MIME_TYPES             = %w(video/webm video/mp4 video/quicktime video/ogg).freeze
+  VIDEO_CONVERTIBLE_MIME_TYPES = %w(video/webm video/quicktime).freeze
+  AUDIO_MIME_TYPES             = %w(audio/wave audio/wav audio/x-wav audio/x-pn-wave audio/ogg audio/mpeg audio/mp3 audio/webm audio/flac audio/aac audio/m4a audio/3gpp).freeze
 
   BLURHASH_OPTIONS = {
     x_comp: 4,