I'm trying to send a POST request from Unity to my web service endpoint in Node.js; I'm able to send emails without adding any attachments. But, when I try to send an array of attachments I always get this error.
Error: Cannot use 'in' operator to search for 'contentTransferEncoding' in [{filename: 'test.txt', contentType: 'text/plain', content: 'Hello World!', contentTransferEncoding: 'quoted-printable'}]
I also tried to send a POST request from Postman but I get same error.