MailCore.MailCore.sendMail - attachment decode issue

[YujinKim0624]

MailCore.sendMail is working, however, the attachments (pdf or any images) comes with an error.

MailCore.sendMail({
headers: {
key: 'value'
},
from: {
...
},
to: {
..
},
subject: 'test',
body: '',
attachments: ["../../../Pdf/create_document.pdf"]
})

I simply put a file in a folder, and received an email with that file. However, got an error from the acrobat reader : Adobe Acrobat Reader could not open 'out[2].pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded).

I am not sure whether it brings the correct file or not. Is there any way to validate this?