Attach Files To List Items. Click OK to attach the file to item. Then click on the Attachments link to add attachments to a SharePoint list item like below.
Go to List Settings Advanced Settings. In the ribbon click on Items - Attach File. Add a single item to a list Navigate to the site containing the list where you want to add an item.
This method takes either a string Blob or ArrayBuffer.
But you will need the attachment file ID for that. Then click on the Attachments link to add attachments to a SharePoint list item like below. You have to create the item and then add an attachment to it. Navigate to the list select a list item Click on Attach File button from the Items tab of the ribbon.