im getting a please insert a valid manifest file route error when trying to upload a custom viz

Hi, i have all 3 public files in a public s3 bucket. all 3 files are perfectly reachable via their public URL however I'm getting a please insert a valida manifest file route error when I try to add the manifest route. I am trying to upload a custom radar viz since the one that was available disappeared. would gladly make it available to the community as well but cannot get Looker to accept my https route.

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