Hi @rizwanmahfooz,
The error means that there is something wrong with input parameters in your “Add attachment” action.
I have made a test on my side and don’t have the issue that you mentioned. The flow works successfully as below:
Please check if you fill proper File Name and File Content in “Add attachment” action.
Besides, please check if you have set Has Attachment and Include Attachments property to YES. The screenshot of trigger’s configuration as below:
Best regards,
Kris
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