Well I have found a way to do this
1) Install the toolkit plugin>> add a custom field "Number of Attachments"
2) Create a validation in the workflow >> No of Attachments >0
@Christian Czaia:- Pardon me for this, If I ask any question here that itself with a sense of gratitude whether it is answered or not. So I think I explained the reason of your hurt. By the way "Thank everyone for your help"
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