Blank PDF using Postman

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Hi everybody :slight_smile: ,
I have a problem when I upload a PDF using postman.
This is the first time I use it so i followed this tutorial and used the Library Upload API.

It return me this :

{"files":[{"name":"test1","size":31281,"type":"application\/pdf","url":"\/api\/library?file=tutoDateHorloge.pdf&download=1","mediaId":166,"storedas":"166.pdf","duration":60,"retired":0,"fileSize":31281,"md5":"89b7cccc3d46c89ee9e7e48756d5144e","delete_url":"\/api\/library?file=test1","delete_type":"DELETE"}]}

But in the layout editor, the pdf is a blank region :confused:
Do someone know how to make the PDF visible ?
Thank !