empty pdf page

[webstudio19]

don't think it's a problem with the server... but with the viewer or its version...

As you can see, if I want to open a PDF resource with the viewer, it gives me a blank page or an empty PDF

https://garanzia.mam-srl.it/ViewerJS/#../bcs_740.pdf

while the resource is here

https://garanzia.mam-srl.it/pdf/bcs_740.pdf

i donwload a 0.5.8 versione and the problem persist

you can give me support?

thankss thanks