If I cannot find the accepted version of my paper, can I submit my published version or pre-print version to DR-NTU to comply with NTU Open Access Policy?

You must comply with your publisher’s self-archiving policy to submit a proper version of your paper. If you cannot find a proper version, we would suggest you to only submit the metadata record of your paper to DR-NTU to avoid any copyright infringement.

It is a good practice to always keep your accepted version, as, according to the statistics from Sherpa Romeo website, 42% of publishers (as of 23 April 2020) allow accepted version to be deposited to institutional repositories like DR-NTU for open access.