This is probably due to some setting I have on, but I can't work out which...

I use an iPhone and a Macbook Pro so I have the files app on my iPhone to enable me to view files which are on my laptop (i.e. excel spreadsheets) however, ever since installing the Zoho mail app, each time I click on one of these files to view, it take me straight to the Zoho mail app and begins composing a message (the file is not attached).

I have deleted the Zoho mail app to see if this is the issue and the files opened fine... I have now reinstalled the Zoho mail app and the issue persists....

How can I stop this from happening?

Thanks