Hi,
I have a workflow that is triggered when a list item is created, I then lookup some data in a separate list and use an Update Item to amend the original item. This flow works well unless the original item has attachments, in that case I get the following error,

The Comments field referenced here has content from the Create Item as it is a required field, it also has content in the Update Item call that I have set manually set (not dynamic content)
I have also tried using Send an HTTP request to SharePoint to pass the update but it also gives a value missing error that is not so detailed, All required fields are populated in both instances.
Any help appreciated