Add timestamp to attachable file name to avoid cache issues with CDN
Add timestamp to attachable file name to avoid cache issues with CDN

See the "Updating Existing Files Using Versioned File Names" section of
CloudFront's updating existing content article:
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/UpdatingExistingObjects.html#ReplacingObjects

dylanfisher/forest,dylanfisher/forest,dylanfisher/forest