PDF wrong formatted in pro?

Hi,
I tested file manager first, all good, then ordered pro.

This is what I get:

– When I upload a pdf in file manager, I can download it again and open. All OK.
– When I upload a pdf in file manager pro, download is no longer readable:

Acrobat Reader: “Acrobat Reader could not open because it is either not a supported file type or because is was damaged (for example, it was sent as an email attachment and wasn’t correctly decoded)”

Allowed MIME types are all set (Text,Image,Application,Video,Audio)

Any idea?