Cant activate links in iOS

I have .docx and .md files with urls embedded in them. On a laptop using chrome, links work by holding down the control key while clicking the link. However I cannot see what the mechanism is to go to a link on iOS. The problem occurs in a browser (Chrome) and in the NextCloud app.

If you select the link you can edit the text but not goto the url.

Am I missing something obvious?

This seems peculiar to our server, I set up an account on the demo nextcloud server and that works fine. Can anyone give me a clue that I can pass on to the people who have set up our server?

Does anyone have any thoughts on this?