As we have to use ports to access the FileReader API, I’m facing the 
situation where I want to do the equivalent of 

http.get ("signature" := string) "/api/signature" 
`Task.andThen` (\sig -> sendS3 sig)
|> Task.perform....

where port sendS3Cmd : String -> Cmd msg

Clearly this does not type check, but I’m wondering whether there any ways 
to chain these side effects other than waiting for the upload function to 
be recalled?
​

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