Office 365 Upload file workflow action errors with "The file to upload is too big. The server does not allow file size larger than 2097152 bytes"  even though no upload limit of 2MB has been set, after updating workflow action to use connection manager feature

A defect request was raised and has since been fixed. Update to the latest version of Nintex Workflow for Office 365 App accordingly. If issue still exist then re-create the workflow action