Sequential execution on what appears to be async code

[adnan]

    import strutils, sequtils, os, strformat, httpclient, asyncdispatch
    
    # const links: seq[string] = # omitted
    const dir = "dir"
    os.createDir(fmt"{os.getCurrentDir()}/{dir}")
    
    proc download(link: string; i: int): Future[void] {.async.} =
        var fileName = fmt"{os.getCurrentDir()}/{dir}/{i}.webm"
        var client = newAsyncHttpClient()
        echo(fmt"Downloading {filename}...")
        await downloadFile(client, link, fileName)
        echo(fmt"Downloading {filename} success.")
    
    
    proc main() {.async.} =
        for i, link in links:
            await download(link, i)
    
    waitFor main()
    
    
    Run

I have moved my `download` logic to an async function and called `await` on the 
callsites of the `download` function. I `waitFor` the calle (`main`) which is 
also an async function. Yet I keep getting sequential downloads of `links`. I 
want to download the fils asynchronously. How should I proceed?