VRFS-3936 had to tweak mobile recording uploads

ruby/lib/jam_ruby/models/mobile_recording_upload.rb

@@ -28,8 +28,12 @@ module JamRuby
       # save first to get a valid created_at time
       mru.save!
 
+      # CarrierWave says we need a file extension, doesn't get provided
+      tmpfile = Tempfile.new([file_name, File.extname(file_name)])
+      tmpfile.write(file)
+      
       # now that the model exists (created_at exists), we can save the file in the correct path
-      mru.file_url = file
+      mru.file_url = tmpfile
       mru.save
       mru
     end