lib/hello_sign/client.rb in hellosign-ruby-sdk-3.0.14 vs lib/hello_sign/client.rb in hellosign-ruby-sdk-3.0.15

@@ -188,10 +188,10 @@
 
     def prepare_files(opts)
       if opts[:files]
         opts[:files].each_with_index do |file, index|
           if file.is_a? String
-            opts[:"file[#{index}]"] = Faraday::UploadIO.new(file, 'application/pdf')
+            opts[:"file[#{index}]"] = Faraday::UploadIO.new(StringIO.new(file), 'application/pdf')
           elsif defined? ActionDispatch::Http::UploadedFile
             if file.is_a? ActionDispatch::Http::UploadedFile
               opts[:"file[#{index}]"] = UploadIO.new(file.tempfile, 'application/pdf')
             end
           else