Good day,
I go to https://www.confluent.io/installation/ , and download the Confluent platform in ZIP file under “Local”, after unzip it, I continue to start the confluent platform by the following command:
confluent local services start
I can see all the service started correctly, and I able to view my control center throw browser.
And this is the folder structure of my Confluent platform:
After that, I referring to https://docs.confluent.io/kafka-connect-sftp/current/source-connector/index.html#configuration-properties , to install the sftp connector.
I install the connector by the following command:
confluent-hub install confluentinc/kafka-connect-sftp:latest
Command run successfully, and I can see the folder created in /share/confluent-hub-components 
Base on the guide from confluent website, I need to create 1 file call sftp.json , and then load the connector by following command:
confluent local services connect connector load CsvSFTP --config sftp.json
However, I am hitting error like follow:
[meow@localhost confluent-7.0.1]$ confluent local services connect connector load CsvSFTP --config sftp.json
The local commands are intended for a single-node development environment only,
NOT for production usage. https://docs.confluent.io/current/cli/index.html
{
"error_code": 500,
"message": "Failed to find any class that implements Connector and which name matches io.confluent.connect.sftp.SftpCsvSourceConnector, available connectors are: PluginDesc{klass=class io.confluent.connect.replicator.ReplicatorSourceConnector, name='io.confluent.connect.replicator.ReplicatorSourceConnector', version='7.0.1', encodedVersion=7.0.1, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/kafka-connect-replicator/'}, PluginDesc{klass=class org.apache.kafka.connect.mirror.MirrorCheckpointConnector, name='org.apache.kafka.connect.mirror.MirrorCheckpointConnector', version='1', encodedVersion=1, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/kafka/'}, PluginDesc{klass=class org.apache.kafka.connect.mirror.MirrorHeartbeatConnector, name='org.apache.kafka.connect.mirror.MirrorHeartbeatConnector', version='1', encodedVersion=1, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/kafka/'}, PluginDesc{klass=class org.apache.kafka.connect.mirror.MirrorSourceConnector, name='org.apache.kafka.connect.mirror.MirrorSourceConnector', version='1', encodedVersion=1, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/kafka/'}, PluginDesc{klass=class org.apache.kafka.connect.tools.MockConnector, name='org.apache.kafka.connect.tools.MockConnector', version='7.0.1-ce', encodedVersion=7.0.1-ce, type=connector, typeName='connector', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/acl/'}, PluginDesc{klass=class org.apache.kafka.connect.tools.MockSinkConnector, name='org.apache.kafka.connect.tools.MockSinkConnector', version='7.0.1-ce', encodedVersion=7.0.1-ce, type=sink, typeName='sink', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/acl/'}, PluginDesc{klass=class org.apache.kafka.connect.tools.MockSourceConnector, name='org.apache.kafka.connect.tools.MockSourceConnector', version='7.0.1-ce', encodedVersion=7.0.1-ce, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/acl/'}, PluginDesc{klass=class org.apache.kafka.connect.tools.SchemaSourceConnector, name='org.apache.kafka.connect.tools.SchemaSourceConnector', version='7.0.1-ce', encodedVersion=7.0.1-ce, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/acl/'}, PluginDesc{klass=class org.apache.kafka.connect.tools.VerifiableSinkConnector, name='org.apache.kafka.connect.tools.VerifiableSinkConnector', version='7.0.1-ce', encodedVersion=7.0.1-ce, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/acl/'}, PluginDesc{klass=class org.apache.kafka.connect.tools.VerifiableSourceConnector, name='org.apache.kafka.connect.tools.VerifiableSourceConnector', version='7.0.1-ce', encodedVersion=7.0.1-ce, type=source, typeName='source', location='file:/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/java/acl/'}"
Looks like my confluent platform did not load the connector that I install, then I go to edit the plugin.path value in connect-standalone.properties , add in the newly install connector path:
plugin.path=/usr/share/java,/home/meow/Workspace/confluentPlatform/confluent-7.0.1/share/confluent-hub-components
And then follow by restart my confluent platform, and try again, result still same, error message still same. Please advise which mistake I have make.
And how can I know the confluent-standalone.properties is being loaded when starting Confluent Platform, because I check my log in /home/meow/Workspace/confluentPlatform/confluent-7.0.1/logs , its not append there unless schema-registry.log .
kindly advise.