Just copied across as Lua file no editing. I seem to be able to save and Bas files (e.g. countdown intervalometer) but not Lua files. Is there a trick to copying and saving Lua scripts? Thanks.
If you just download the file and copy it to the SD card using your computers normal file copy, there should be no difference between bas and lua files, and no change to the content.
If you are copy / pasting code, you need to use a plain text editor (like notepad on windows) and save the file as ASCII text. However, assuming you are using the script in this thread, you shouldn't need to do this because there's a download link in the first post.
edit:
If you are being prompted to download or open the file, you should download.