Document previews
When you're using the file browser in Asset Data Insight, you may see a message like this to notify you that you can not preview the current file:

You can only preview certain types of files inside Asset Data Insight. To preview other types of files, click the download link and then open the file locally.
Supported documents
Currently, only Clickable P&ID documents can be previewed in Asset Data Insight.
Help
Contact support@cognite.com if you need more help.