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

# Drawings and Viewer

> File management, PDF viewing, and collaboration capabilities.

# Drawings and Viewer

PlanSync’s drawing system combines file storage, versioning, and viewer collaboration.

## File and folder management

* Create folder structures in each project
* Upload files with version-aware workflows
* Rename and reorganize folders/files
* Remove outdated files safely

## Viewer capabilities

* Open project files in-browser
* Navigate sheet versions
* Save/restore viewer state
* Lock file versions for controlled editing periods

## Collaboration

For workspaces with collaboration enabled:

* Presence and heartbeat APIs keep active viewer sessions visible
* Event streams support real-time viewer updates
* Sessions can be explicitly ended/left

## Public/free viewer

PlanSync also includes a standalone viewer experience for non-workspace usage. This is separate from authenticated project data.

## Storage guidance

Upload and read access is handled through presigned URL flows. Keep object store credentials in your backend environment only.