Not able to upload any file

You need to set permissions on the upload folder for read, write and execute. Otherwise you cannot upload to it.

Only encrypted images can be uploaded (as .class files). To protect PDF you add an encrypted image to trigger protection and then you can add any media in the normal way and it will be protected from Printscreen and capture. However in the case of PDF printing must be disabled at the PDF creation stage.

But you need to use encrypted images that have been created for “your” website and for that you need to purchase the Copysafe Web software.