Problem with multiupload

Hi, I created a form with multiupload, with the next parameters:

In field Document Type: Document (data base), type Blob
In Field Name Document: Name of Document, type TEXT.

When I inserted a new register, this is insert in data base but when the grid called it this is download the file but i don’t see. the file is unrecognizable

I Saw the tutorial and video for create multiupload, however, I didn’t work

Help me please.