feat: Break down s3-compatible configurations

Author: tomasfarias

contents/docs/cdp/batch-exports/s3.md

@@ -15,7 +15,7 @@ With batch exports, data can be exported to an S3 bucket.
 1. Subscribe to data pipelines add-on in [your billing settings](https://us.posthog.com/organization/billing) if you haven't already.
 2. Click [Data pipelines](https://app.posthog.com/pipeline) in the navigation and go to the **Destinations** tab in your PostHog instance.
 3. Search for **S3**.
-4. Click the **+ Create** button. 
+4. Click the **+ Create** button.
 5. Fill in the necessary [configuration details](#s3-configuration).
 6. Finalize the creation by clicking on "Create".
 7. Done! The batch export will schedule its first run on the start of the next period.
@@ -68,4 +68,26 @@ We intend to add support for other common formats, and format-specific configura
 
 ### S3-compatible blob storage
 
-PostHog S3 batch exports may also export data to an S3-compatible blob storage like [MinIO](https://github.com/minio/minio). Simply set the *Endpoint URL* to your blob storage's host and port, for example: `https://my-minio-storage:9000`.
+PostHog S3 batch exports may also export data to an S3-compatible blob storage like [MinIO](https://github.com/minio/minio), [Cloudflare R2](https://www.cloudflare.com/developer-platform/products/r2/), or [Google Cloud Storage (GCS)](https://cloud.google.com/storage). Here we describe configuration tweaks that are required for S3-compatible blob storage destinations that we have tested.
+
+#### MinIO
+* Set the *Endpoint URL* configuration to your MinIO instance's host and port, for example: `https://my-minio-storage:9000`.
+
+#### Cloudflare R2
+* Set the *Endpoint URL* configuration to the following after replacing your account id: `https://<ACCOUNT_ID>.r2.cloudflarestorage.com`.
+* From the *Region* dropdown, select one of the Cloudflare R2 regions that correspond to your bucket, like "Automatic (AUTO)".
+
+#### Google Cloud Storage (GCS)
+Access to GCS for batch exports follows a similar process to accessing [BigQuery](/docs/cdp/batch-exports/bigquery)
+ as a Service Account is required:
+1. Follow the steps in the [BigQuery documentation](/docs/cdp/batch-exports/bigquery) to create a Service Account.
+2. Create a [HMAC key for your Service Account](https://cloud.google.com/storage/docs/authentication/managing-hmackeys#console).
+3. Grant the Service Account the `Storage Object User` role or a custom role with at least the following permissions:
+   * `storage.multipartUploads.abort`
+   * `storage.multipartUploads.create`
+   * `storage.multipartUploads.list`
+   * `storage.multipartUploads.listParts`
+   * `storage.objects.create`
+   * `storage.objects.delete`
+4. Use the HMAC key access key and secret key as *AWS Access Key ID* and *AWS Secret Access Key* respectively when configuring your batch export.
+5. Finally, set the *Endpoint URL* configuration to: `https://storage.googleapis.com`.