The structure of meta-data area of a Story HTML file created using the Twine 1.x application is different to that of a Twine 2.x application's, and for reasons only known to the developers of the Twine 2.x application its "Import From File" option only supports the newer structure.
If the old Story HTML file was built using the Sugar**Cube** story format then there are a number of ways you can convert that old HTML file to a Twine 2.x one:
1. The Twine 1 compiled HTML to Twine 2 archive converter.
This utility can be downloaded from the Utilities section of the SugarCube 2 web-page.
2. The TweeGo TWEE compiler
This command line utility has the ability to decomple an old Story HTML file into a TWEE based file, which can then be compiled into either a new Story HTML file or a new Twine 2 Archive file. Either of these new files can be imported into the Twine 2.x application.