Hi @tmfitz 

You can use SPO APIs to delete the list attachments.

Refer to this article

Here is a YouTube Video - Please note that this is done in O365 Workflow

Thanks @Garrett.  This example is using Nintex Workflow for O365. I’m using Nintex Workflow Cloud.  But this is a good example to start and I’ll see if I can translate to NWC.

Hi @tmfitz 

Both the solution are about using the SharePoint Online Web APIs. All you really need to implement the APIs is a web browser. One of the best Web API testing tool is Postman. 

You need to check whether your organization has allowed for the SPO APIs to be used.  

Its just that the YT implementation are using O365.

Important part if you missed reading the article