my app used acts_as_attachment is that old or what should I try using instead ?

I am trying to get an old web site working. It used
acts_as_attachment for file uploads. Alot of my google searches seem
to show that there are not any recent informational posts on it and
particularly not for Rails 3.

Do I need to use something else ?

What should I try ?

http://ruby-toolbox.com/categories/rails_file_uploads.html

I like paperclip. I upgraded from acts_as_attachment. What I did was
upload a file so I could see what it would do, then looked at the file
structure and the database structure for both acts_as_attachment and
paperclip. I was able to write a fairly simple rake task to convert
the old uploads so that paperclip would find them.