Text file share: not online editable


I would like to share a text file with outside users via a link.
I configured the link on the file to be editable.

When I open the shared link, there is only the option to download the file.
I would expect that the online text editor or even better a the Markdown app opens and the users can live edit and save back to the online document.

Is this feature not yet built in or do I need to change something in the configuration?

Many thanks in advance.

Iā€™m afraid yes.