active-storage

To configure Rails Active Storage for file uploads, install it in your project, run the necessary migrations, and set up storage service backends for model attachments and image variant processing.

Active Storage supports direct uploads to configured local or cloud storage services, allowing users to upload avatars and documents directly while automatically handling processing and storage.

The best way to handle multiple file attachments in a Rails application is using Active Storage, which natively supports model attachments with single and multiple files plus automatic image variant processing.

Active Storage can automatically generate thumbnails and image transformations through variant processing, streamlining image-processing workflows for user-uploaded images in your Rails application.

You need to run the necessary migrations to set up Active Storage in your Rails project, which enables the core upload functionality, model attachments, and variant processing features.