I'm not an expert so please help if you can: I have posted the screen shot along with the write up.
/sites/GRPTiffanyAvinSandbox/Lists/EmployeePersonnelWF/Attachments/30/TEST page.docx
2/13/2019 9:18 AM Comment
https://mckessoncorp.sharepoint.com/sites/GRPTiffanyAvinSandbox//_api/web/getfilebyserverrelativeurl('/sites/GRPTiffanyAvinSandbox/Lists/EmployeePersonnelWF/Attachments/30/TEST page.docx')/copyto(strnewurl='/GRPTiffanyAvinSandbox/Employee%20Documents
2/13/2019 9:18 AM Comment
BadRequest - {"error":{"code":"-2147024809, System.ArgumentException","message":{"lang":"en-US","value":"Server relative urls must start with SPWeb.ServerRelativeUrl"}}}
_______________________
{Workflow Context:Current site URL}/_api/web/getfilebyserverrelativeurl('{Variable:AttachmentURL}')/copyto(strnewurl='/GRPTiffanyAvinSandbox/Employee%20Documents/{Variable:AttachmentFileName}',boverwrite=true)
Link to the orginal post: