# File previews and attachments

Attach files to any record, preview them without downloading, and manage attachments directly from the form.

## Attaching files[​](#attaching-files "Direct link to Attaching files")

### Upload methods[​](#upload-methods "Direct link to Upload methods")

* **Drag and drop** - drag files from your desktop onto the record form
* **File picker** - click the attachment area and select files from your computer
* **Paste** - paste images from your clipboard directly into the form

Files are stored in the Comind.work virtual filesystem (VFS) and linked to the record. For more details on how files work across the platform, see [Working with files](/user-guide/common-features/working-with-files.md).

The maximum file size is 2 GB. On Enterprise plans, this limit can be increased up to 100 GB.

### File list display[​](#file-list-display "Direct link to File list display")

Attached files appear as a list with:

* File name and extension
* File size
* Upload date
* Thumbnail preview (for images and supported document types)

## Previewing files[​](#previewing-files "Direct link to Previewing files")

Click on an attached file to open a preview without downloading it.

### Supported preview formats[​](#supported-preview-formats "Direct link to Supported preview formats")

| Format                                     | Preview type        |
| ------------------------------------------ | ------------------- |
| Images (PNG, JPG, GIF, SVG)                | Inline image viewer |
| PDF                                        | Document viewer     |
| Microsoft Office (Word, Excel, PowerPoint) | Document preview    |
| Text files                                 | Plain text display  |
| Video                                      | Video player        |

Office file previews are generated automatically on the server. For full editing capabilities, use the [WebDAV integration](/user-guide/common-features/webdav-and-office-editing.md) to open files directly in your desktop Office application.

### Thumbnails[​](#thumbnails "Direct link to Thumbnails")

Image files and supported document types generate automatic thumbnails. Thumbnails appear:

* In the file attachment list on the record form
* In grid cells when using a file preview renderer
* In card view layouts

The platform generates thumbnails automatically when files are uploaded.

## File operations[​](#file-operations "Direct link to File operations")

| Action             | Description                                                                                                                                       |
| ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Download**       | Save the file to your local machine                                                                                                               |
| **Preview**        | View the file in the browser                                                                                                                      |
| **View in Office** | Open Office documents for in-place editing via WebDAV (see [WebDAV and Office editing](/user-guide/common-features/webdav-and-office-editing.md)) |
| **Delete**         | Remove the attachment from the record                                                                                                             |

## Files in lists[​](#files-in-lists "Direct link to Files in lists")

File attachments can be displayed in list views using the file preview cell renderer. This shows thumbnails or file icons directly in grid columns.

The **File folders** list format provides a dedicated file/folder navigation experience for apps that primarily manage documents.

## Performance[​](#performance "Direct link to Performance")

For workspaces with large numbers of files:

* Thumbnails load lazily as you scroll
* Long file lists are paginated

## Related[​](#related "Direct link to Related")

* [Rich text editor](/user-guide/app-record/rich-text-editor.md#images) - paste images from your clipboard into content fields