Hello @RMandugula,
Please refer to the below link:
https://www.servicenow.com/community/itom-forum/using-flow-designer-add-attachment-to-send-email-act...
If it is helpful, please hit the thumbs up button and accept the correct solution; by referring to this solution in the future, it will be helpful to them.
Thanks & Regards,
Abbas Shaik
