adobe attach

[#1]

in adobe reader i cannot drag files like word ,excal and attach it to my pdf file but in adobe pro i can do that is this  feature only in pro 

[#2]

Yes, converting to PDF is only available in Acrobat Pro, not in Acrobat Reader.

[#3]

No, you can't attach files in Reader by dragging and dropping them. You can use the Attach File commenting tool, though, if you have Reader DC.