When you make a GET asset request to our API, we provide a full set of available transcode URLs on the response, and leave it up to the user which file to use.

The original asset you sent to Frame.io is accessed with the property original, whereas the 1080P proxy is: h264_1080_best

In the context of a fetch() request:

    try {
        let response = await fetch(url, requestOptions);
        let result = await response.json();
        console.log(`debug: name: ${result.name}, url: ${result.h264_1080_best}`);
        return { url: result.h264_1080_best, name: result.name };
    } catch(err) {
        return (`error: ${err}`);
    }

To find assets contained in version stacks, add an include= query string to a GET asset API request:

    let url = `http://api.frame.io/v2/assets/${id}?include=cover_asset`;

The request will now return a result.cover_asset object containing the top-level version from the stack. With a few more lines of code, you can add a conditional to pass the correct video file back to your function if and only if the asset type matches version_stack:

    try {
        let response = await fetch(url, requestOptions);
        let result = await response.json();
        if (result.type == "version_stack") {
            console.log(`resource is a version stack. debug cover asset -  name: ${result.cover_asset.name}, url: ${result.cover_asset.original}`);
            return { url: result.cover_asset.original, name: result.cover_asset.name };
        } else {
            return { url: result.original, name: result.name };
        }
    } catch(err) {
        return (`error: ${err}`);
    }
}