I have a Flow in SharePoint with Nintex, when I start the flow and copy the documents to a library, it throws the following message: "The request message is too large. The server does not allow messages greater than 2097152 bytes". Could you tell me what is due?
It seems that your file is >2mb.
Is your workflow working with a smaller file? If this is the case then you may want to modify the document size settings using the link provided by Fernando or compress your documents before uploading them so they are not that large.