Upload file to S3 Signed URL

I am having trouble figuring out how to put a file to a signed url. I've tested sending this same file using postman without any issues so I know it must just be how I'm implementing it in Xano.

I using the file resource in the external API call but, despite trying to put the file in the parameter in various different ways, I can't get it to work.

I've seen the various posts about this but none of them seem to be leading me to a solution.

output from get file resource
{'name':'hello.png','size':5,'mime':'image/png','data':'hello'}

put the file:

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