Upload Field

Example uses:
- To provide a 
Pagewith a featured image - To allow for a 
Productto deliver a downloadable asset like PDF or MP3 - To give a layout building block the ability to feature a background image
 
Config
Option  | Description  | 
|---|---|
   | To be used as the property name when stored and retrieved from the database. More  | 
   |  Provide a single collection   | 
   | A query to filter which options appear in the UI and validate against. More.  | 
   | Sets a number limit on iterations of related documents to populate when queried. Depth  | 
   | Text used as a field label in the Admin panel or an object with keys for each language.  | 
   | Enforce that each entry in the Collection has a unique value for this field.  | 
   | Provide a custom validation function that will be executed on both the Admin panel and the backend. More  | 
   |  Build an index for this field to produce faster queries. Set this field to   | 
   | If this field is top-level and nested in a config supporting Authentication, include its data in the user JWT.  | 
   | Provide field-based hooks to control logic for this field. More  | 
   | Provide field-based access control to denote what users can see and do with this field's data. More  | 
   | Restrict this field's visibility from all APIs entirely. Will still be saved to the database, but will not appear in any API or the Admin panel.  | 
   | Provide data to be used for this field's default value. More  | 
   |  Enable displaying preview of the uploaded file. Overrides related Collection's   | 
   | Enable localization for this field. Requires localization to be enabled in the Base config.  | 
   | Require this field to have a value.  | 
   | Admin-specific configuration. See the default field admin config for more details.  | 
   | Extension point for adding custom data (e.g. for plugins)  | 
* An asterisk denotes that a property is required.
Example
collections/ExampleCollection.ts
Filtering upload options
Options can be dynamically limited by supplying a query constraint, which will be used both for validating input and filtering available uploads in the UI.
The filterOptions property can either be a Where query, or a function returning true to not filter, false to prevent all, or a Where query. When using a function, it will be called with an argument object with the following properties:
Property  | Description  | 
|---|---|
   |  The   | 
   | An object of the full collection or global document currently being edited  | 
   | An object of the document data limited to fields within the same parent to the field  | 
   |  The value of the collection   | 
   | The currently authenticated user object  | 
Example:
You can learn more about writing queries here.