Setup Liferay’s document management with an Amazon S3 as a repository

Issue

How to set up Liferay to use Amazon S3 storage instead of local storage and provide access information to S3.

Steps to follow :
- Amazon S3 requires a 'SAXParser' from the application server to operate. Apache Tomcat meets this requirement, therefore, the below property only needs to be added in a 'system-ext.properties' file
  - ```
  org.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser
```
- Place system-ext.properties file in a folder that resides in Liferay DXP installation’s classpath (e.g., /WEB-INF/classes/).
- Set the following property in a portal-ext.properties file in the Liferay Home folder:
  - ```
  dl.store.impl=com.liferay.portal.store.s3.S3Store
```
Restart Liferay DXP.
In the Control Panel, navigate to Configuration → System Settings → File Storage
In the S3 Store screen, configure the store:
- Bucket Name: bucket’s name.
- Access Key: AWS access key.
- Secret Key: secret key.
- S3 Region: The geographic region; the default is us-east-1.
Leave the other fields on the default settings.
Click Save
Restart Liferay DXP.
Now, the Liferay DXP instance is using the Amazon S3 store.

You may encounter an error that requires you to set the S3Endpoint parameter.
Amazon’s Simple Storage Service (S3) is a cloud-based storage solution that can be used with Liferay.
An Amazon Web Services (AWS) account is needed and then setup is very easy. After registering for an account, Amazon assigns some credentials (Access Key ID & Secret Key) via AWS Identity and Access Management (IAM). When creating an S3 bucket, you will be provided with a Bucket Name. All of these should be set as configuration values in Liferay.
Then the documents can be stored in the cloud from Liferay Application Server(s), seamlessly.