[Rails] authenticity_token shows up in the url when page reloads

I'm pretty new to Ruby On Rails (and somewhat self-taught), so bear with
me if I'm asking something stupid. So whenever I push my download button
(which just uses send_file, if that's any help) it reloads the page,
without downloading, and it puts the authenticity_token in the url. This
all the button is:
<% form_remote_tag :url => { :action => 'download'} do %>
<%= submit_tag "Download" %>
<% end %>

Basically, it's just not working at all, and I would appreciate any sort
of help with the issue. Thanks in advance.
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