Preview is limited to files sized 500MB or smaller. Video files are the exception; these can be up to 3.5 hours long. However, videos exceeding 2.5 hours can encounter problems when previewed or streamed.

Video preview without Box login using Public shared link is only limited up to 1 hour.

Preview is limited to viewing Excel sheets of fewer than ~100 columns and ~100,000 rows, or you can use the Excel online previewer., which allows viewing files of up to 50MB.