Gmail attachment from Webhook

I am trying to send an attachment via a URL caught with a webhook. I have tested the URL to be valid, and it downloads the file from multiple computers and networks.

The email sent and received is fine, but it is absent the attachment. I have tested attachments as small as 1mb and as large as 25mb, nothing works. Can anyone point me in the right direction?

Does anyone have a solution for this? I have just updated to 0.20.3 and it is still not attaching.

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