Files app, Dropbox and Office apps

Hi all

I have Word app installed on my iPhone, Excel and OneNote as well.

The issue occurred with Excel files too. With OneNote I didn’t try.

Please see these 3 images:

1 - My Files app where you can see several word documents. When I tap one of them...

https://www.dropbox.com/s/k2528al3bx54wqh/Photo%2010-09-2019%2C%2021%2048%2024.png?dl=0

2 - ... Dropbox opens.

https://www.dropbox.com/s/u8a5g05d73pk3ex/Photo%2010-09-2019%2C%2021%2037%2006.png?dl=0

3 - After that, in iCloud Drive app, the download icon (a cloud with an arrow) has gone.

https://www.dropbox.com/s/wtbd8o7niw29l17/Photo%2010-09-2019%2C%2021%2049%2011.png?dl=0

It's very annoying. I just want to open the file, not send it to dropbox.

Any help?

Regards

Pedro