# File attachments + previews

> Drop any file into a community post. The right preview renders automatically — images, videos, audio, PDFs, anything.

Last updated 2026-05-20 · Source: https://prolaud.com/help/batches-attachments

## How to attach

Click Attach in the community's Common Room composer and pick any file (multi-select supported). Each upload uses the same R2 pipeline as course thumbnails and lesson assets, so files end up on your CDN with a permanent URL.

## Type-aware previews

- Images (PNG / JPG / GIF / WebP / AVIF / SVG) → inline thumbnail; click to open fullscreen.
- Videos (MP4 / WebM / OGV / MOV) → inline <video> with native HTML5 controls + picture-in-picture.
- Audio (MP3 / WAV / OGG / M4A) → audio widget under the filename.
- PDFs → embedded preview iframe + a download chip beneath.
- Anything else → download chip with the filename + file size.

## Empty bodies are allowed

You can post a file with no commentary — drop a slides PDF and hit Post. The composer accepts body-only, attachment-only, or both.

## Related

- [Tagging people in community posts](https://prolaud.com/help/batches-mentions)