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

# Custom Bucket Provider

> Connect to Parquet files in Custom Bucket Provider.

Bucket connectors read Parquet files directly from your cloud storage. Evidence queries the data in place using ClickHouse's S3 table engine—no data is copied.

See [Connector Types](/data-sources/index) for a comparison of database vs bucket connectors.

## How Data Updates Work

* **Row changes**: When you add, update, or remove rows in a Parquet file, the changes are available immediately in Evidence
* **Schema changes**: Adding or removing columns requires clicking **Publish** or waiting for a scheduled refresh

## Combining Multiple Files

Multiple Parquet files in the same folder can be combined into a single source. Use the `prefix` option to specify the folder path. All files must share the same schema.

## Connection Options

<ResponseField name="Host (my.provider.tld)" type="text" required />

<ResponseField name="Bucket Name" type="text" required />

<ResponseField name="Access Key" type="text" required />

<ResponseField name="Secret Key" type="password" required />

<ResponseField name="prefix (e.g. folder_one/2021/data)" type="text" />

<ResponseField name="Port" type="number" />