What the container-tag read shows.

The local check reads the first container metadata block. It lists title, artist, album, comment, description, genre, date, and copyright. An empty line means that tag was not in the block.

The read stops at 150 MB. The file stays in the browser. The check does not upload the file, does not change the file, and does not use a cloud output.

Stream tags and other container fields stay off the list. The cloud metadata job is a different step. That job replaces supported device and capture tags on a new copy.

A tag list does not guarantee reach, approval, or a lower ad cost.