We're running into an issue where we can't use the S3Store plugin within the AWS Canada region because that region is newer than what the current AWS-Java-SDK-Core.JAR understands.
Per Josef Šustáček:
I found the Java SDK inside: osgi/marketplace/Liferay Foundation.lpkg -> com.liferay.portal.store.s3* -> lib/aws-java-sdk-core-1.10.11.jar
I think the ca-central-1 was added in 1.11.x (but I'm not sure at all). We will need to get a new .jar (or whole lpkg) with newer AWS SDK inside, otherwise we cannot have doclib in ca-central-1.
reference ticket: LGS-5261