I have run into the same issue that you discussed in this post:
Link to URL
Did you ever find a solution to this?
Sending a Binary File to S3 Using Webhooks by Zapier - Follow Up
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I eventually ended up building it inside of Tray.io, which did work. They had a bit more ability to handle the file storage. Couldn’t get it to work in Zapier directly.
Gotcha. Thank you. I greatly appreciate the help.
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