> Btw Is there a preferred way to generate a one (or multiple) time access url for a temporarily stored file?

I use file pointers whenever possible. Regardless if it's a [local file](https://github.com/photo/frontend/blob/master/src/libraries/adapters/FileSystemLocal.php#L50) or a [remote file](https://github.com/photo/frontend/blob/master/src/libraries/adapters/FileSystemS3.php#L61).