Apex
Platform Events

Considering you've already gone through Events﻿ section of the documentation, this article will walk you through on how to subscribe to thecldfs__CloudFiles_Event__e event, and handle custom logic based on the event type.
If you've set the `CloudFiles Event Mode` setting to custom object, go through this article - Platform Events Apex Handler (Object Type)﻿ 
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Basic Example:
Apex
trigger CloudFilesEventTrigger on cldfs__CloudFiles_Event__e (after insert) {
    //output from GetEventDetails
    List<cldfs.Event> returnedEvents = new List<cldfs.Event>();

    //Inputs for GetEventDetails
    List<cldfs.GetEventDetails.FlowInput> getEventDetailInputs = new List<cldfs.GetEventDetails.FlowInput>();

    //Input mapping for GetEventDetails
    for(cldfs__CloudFiles_Event__e pe : Trigger.new){
        cldfs.GetEventDetails.FlowInput singleInput = new cldfs.GetEventDetails.FlowInput();
        singleInput.event = pe;
        getEventDetailInputs.add(singleInput);
    }

    //Get the event details
    returnedEvents = cldfs.GetEventDetails.GetEventDetails(getEventDetailInputs);

    //Process the returned events
    for(cldfs.Event e : returnedEvents){
        if(e.Type == 'document-processed'){
            System.debug('Context ==> '+e.DocumentProcessed.Context);
            System.debug('Processed Document Id ==> '+e.DocumentProcessed.ProcessedDocumentId);
            System.debug('Processed File Details ==> '+e.DocumentProcessed.File);    
        }
    }
}
trigger CloudFilesEventTrigger on cldfs__CloudFiles_Event__e (after insert) {
    //output from GetEventDetails
    List<cldfs.Event> returnedEvents = new List<cldfs.Event>();

    //Inputs for GetEventDetails
    List<cldfs.GetEventDetails.FlowInput> getEventDetailInputs = new List<cldfs.GetEventDetails.FlowInput>();

    //Input mapping for GetEventDetails
    for(cldfs__CloudFiles_Event__e pe : Trigger.new){
        cldfs.GetEventDetails.FlowInput singleInput = new cldfs.GetEventDetails.FlowInput();
        singleInput.event = pe;
        getEventDetailInputs.add(singleInput);
    }

    //Get the event details
    returnedEvents = cldfs.GetEventDetails.GetEventDetails(getEventDetailInputs);

    //Process the returned events
    for(cldfs.Event e : returnedEvents){
        if(e.Type == 'document-processed'){
            System.debug('Context ==> '+e.DocumentProcessed.Context);
            System.debug('Processed Document Id ==> '+e.DocumentProcessed.ProcessedDocumentId);
            System.debug('Processed File Details ==> '+e.DocumentProcessed.File);    
        }
    }
}
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Apex Types for different platform event types
Line #21 in the example above displays outputs from the DocumentProcessed﻿ event type(i.e. type number 14 in the list below). Depending on your use case, Here are the avilable platform event types and their custom Apex types that you may use to access relevant information:
file-uploaded - FileUpload﻿ 
file-replaced - FileReplace﻿ 
salesforce-file-attached - SalesforceFilesAttached﻿ 
salesforce-file-copied - SalesforceFileCopied﻿ 
folder-created - FolderCreated﻿ 
resource-updated - ResourceUpdated﻿ 
content-version-created - ContentVersionCreated﻿ 
content-version-created-batch - ContentVersionCreatedBatch﻿ 
file-received - FileReceived﻿ 
resource-attached - ResourceAttached﻿ 
document-generated - DocumentGenerated﻿ 
resource-cloned - ResourceCloned﻿ 
file-viewed - FileViewed﻿ 
document-processed - DocumentProcessed﻿ 
document-split - DocumentSplit﻿ 
resource-deleted - ResourceDeleted﻿ 
error-event - ErrorEvent﻿ 
For further information on what each of these event types signify, go through the All Event Types﻿ section of the documentation.
Apex
Platform Events Apex Handler (Object Type)