Attach new file from existing attachment

[Faq]

Hello,

Rails app.
I have set local storage store and cache folder and uploaded file stored in store. There is need to Attach copy of this uploaded file (same name and content, different id) to custom email form.
So tried to do something like:

In model is include Uploader::Attachment(:file)
From form is called method with:
new(file: somefile)

Existing uploaded file when calling somefile, returns:
<Uploader::UploadedFile storage=:store id="c2543a5f6b22b03a28987a1dda618951.docx" metadata={"size"=>121454, "filename"=>"example_name.docx", "mime_type"=>nil}>

new(file: somefile), returns:

#<Attachment::Letter::Document:0x000000010a216550
 id: nil,
 type: "Attachment::Letter::Document",
 file_data: {"id"=>"ca82057757da17666f11ad653cef8510.docx", "storage"=>"cache", "metadata"=>{"size"=>121454, "filename"=>"example_name.docx", "mime_type"=>nil}},

After form is submitted, it is stored in cache not as store.

What is preferred way to do this?

Tried but no luck, by using attacher:
Uploader::Attacher.attach(somefile, storage: :store)

[benkoshy]

I'm having trouble understanding your question?

Is it possible to post an example of what you're trying to do? https://github.com/shrinerb/shrine/blob/master/SELF_CONTAINED_EXAMPLE.md#option-2-manually-set-up-the-self-contained-example

[Faq]

Solution was found. With form should be passed filename.attachment.file not filename.attachment.file_data