> ## Documentation Index
> Fetch the complete documentation index at: https://labs.laer.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Annotation uploads

Annotation uploads add or update coding- or review-related information associated with documents. Annotation uploads also support two modes:

* **Overlay.** Replaces existing annotation data with the new upload.
* **Append.** Adds annotation data while preserving existing values.