Error attachments app

Error attachments app

Hello!

 

When we receive an email under the domain @ fimp.com.mx with attachments (pdf or .doc) does not allow me to see or open them from the Zoho mail app, only from the web.

I mark an error that I attached, what will it be ...?

I have the app for iOS version 2.1.1

Thank you very much for your help.