Thanks for your response. I was setting the content-type header but it wasn't showing which I have resolved now. However I am now getting this error.
Hi Yurri,
I tried removing the ACL part of the payload so just had {"externalRef": "test"} which is all I need to update and it's now working.
Thanks for all your help!
Aeneas
Aeneas,
Glad you've got it to work.
Regards.
files"": {}