---
sourceDocument: Australia Build or modify applications
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/application-development

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia Build or modify applications

ft:clusterId :

    - cadev

bundleId :

    - cadev

workflow :

    - Development, Data, and Analytics


---

# Preview an app file

# Preview an app file in ServiceNow Studio {#ariaid-title1}

Release version: Australia  
Updated May 28, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
Preview app files in ServiceNow Studio before publishing to confirm that the file looks and functions as expected. Only files with a user interface support preview.

## Before you begin

Role required: admin or delegated_developer

## About this task

Use preview to verify how an app file looks and behaves before it reaches end users. Files with preview capabilities open directly in preview mode in ServiceNow Studio, bypassing the record view.

Begin or continue a conversation with Build Agent to edit previewed files through a conversational interaction. For more information, see [Use Build Agent](https://servicenow-prod.fluidtopics.net/oteXoh6bUN5PGPEL~5pIqA "Build Agent is an autonomous AI agent native to ServiceNow that translates plain language instructions into ready-to-deploy applications and metadata, using the platform’s domain language and guardrails. It's purpose-built for full-stack creation and editing across tables, flows, UI, and scripts, and it operates as the core engine for agentic development on the ServiceNow AI Platform.").

## Procedure

1. Navigate to AllApp EngineServiceNow Studio.
2. Preview files from the App details page or from within an open file.

   | Option | Description |
   | Preview from App details | 1. Open an application in the canvas. 2. Next to the file you want to preview, select the more options icon ![](), and select Preview to open the file in preview mode. ![Select the Preview button.]() {#preview-app-file__ul_hwn_d5z_tfc} |
   | Preview from an open file | Files with preview capabilities automatically open in preview mode. After you close the preview, reopen the preview by selecting Preview in the file record. |
   |-|-|

   {#preview-app-file__choicetable_e2q_c5z_tfc}

## Result

Review the file for layout, functionality, and content errors. Return to the canvas to make corrections, then reopen the preview to verify changes.

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