If a field is not otherwise matched, the value does not exist on the system. Please match the value accordingly then. This process will be explained in this article.
If you have imported a large number of assets, the match pages might take long to load and even appear to not respond at all. This is normal behaviour. Please be patient and do not refresh your browser.
You can perform any of these steps in any particular order, but it is advised that you follow the process from import right through to the last step, in order to make sure all asset field matches are done.