To completely disable attachments from your SeamlessDoc: 

1) Select Add Ons and then choose Add Request Attachments. 

2) Once you're in the pop-up window, select the toggle so that it is turned OFF for Enable Attachments. 

To delete attachments from your SeamlessDoc: 

1) Select Add Ons and then choose Add Request Attachments. 

2) Once you're in the pop-up window, find the attachment that you'd like to remove and select the text that says Remove Attachment to the right of Attachment Name.