PDF cannot be exporting from container

[poorroop]

Hi I am trying to export pdf files from a container field.

I can add and export any other file format other than pdf.

I can open and edit the pdf files. I have to manually click on each and save them. But when i try export then i cannot.

When i right click on the container field in Brows mode ? The option of "Export field contents" is grayed

Please let me know if here is any problem?

Thanks