Figured it out. The Arc generator was putting the ImageUploader module in a folder called /web, which is defunct in Phoenix 1.3.

I moved this file to /lib/myapp_web/uploaders/image_uploader.ex and was able to get moving.

I guess Arc’s configuration shouldn’t be much different that in previous Phoenix versions- you have entry for arc in config.exs and for schema you are interested to use file upload, you use proper uses of Arc.Definition and Arc.Ecto.Definition.

I used in my own projects Arc and Arc_ecto, but in the company product we considered Arc to be to much erroneous - upload didn’t work so we decided to drop using Arc at all and it concluded that I wrote simple uploader on my own, which relies on ex_aws.

Basically - Arc creates it’s own file based on the input - it requires filename and binary, so it wraps a map or Plug.Upload to do the upload.

Maybe the function definition of ExAws.S3.put_object/4 is not self explanatory, but it wants you to pass:

• name of the S3 bucket
• file destination
• file content - binary
• additional options like ACL

With that knowledge you can intercept Plug Upload and use ex_aws directly without Arc.

I guess you can still keep uploaders in lib/myapp/web.

Hello
You got here a fully functional project, it’s a bit mess, because I used to test for real projects, but has both arc, arc_ecto S3 and a few other things…