Q:

Copy list item attachment to Document library

I have a requirement to copy list item attachment to document library either through workflow or event receiver.
Requirement :
Custom List "A" and Document Library "B" and some workflows(designer workflows) run on item adding(when a user add attachment) on custom list and in that process when the status gets changed in list "A" the attachment should get copied migrated to Document library.
Note : user will upload only one attachment to list item and only that attachment should be copied / migrated to document library.
Please help me and let me know how to go about it.
Either by  workflow or event receiver.
I tried through designer workflow as mentioned here but getting bad request 
Please let know where I am going wrong

A:

You cannot copy attachments using SPD Workflow as OOTB, however, you could achieve this using 

Visual Studio workflow.
Event receiver as mentioned at Move/Migrate SharePoint List Attachments to Document Library with Created and Modified Date
via REST as mentioned at Using SharePoint Designer 2013 Workflow to copy file 
Check also similar thread how to copy List item attachment to document library with SharePoint Designer workflows?

