Retool's Slack integration now supports the files.getUploadURLExternal and files.completeUploadExternal APIs for uploading files. Slack ended support for their files.upload API on March 11, 2025, and this endpoint is no longer available in the Retool Slack integration.

For most users, no action is required to access the new APIs. For self-hosted organizations that set the SERVE_LOCAL_SPECS environment variable, you must upgrade to version 3.168.0-edge, patch release 3.148.2, or patch release 3.114.17 to access this change.

The workaround described in the Action Required: Update Slack queries using files.upload changelog entry is no longer required.

Slack is ending support for their files.upload API on March 11, 2025. Refer to the Slack changelog for more information.

Retool is working to update our Slack integration as quickly as possible. In the meantime, if you need files.upload functionality, you can use a REST Query to utilize the new files.getUploadURLExternal and files.completeUploadExternal APIs.

This workaround is temporary, and Retool will restore access to file upload functionality within the Slack integration as soon as possible. Another changelog post will be made when the ability to upload files is restored. Other functionality in the Slack integration remains uninterrupted.

Split Pane is a new web app frame pattern that allows users to create a resizable and scrollable frame, with a custom width, alongside the main canvas. You can add a Split Pane frame from the Frames section, or drag it onto the canvas from the Component Tree.

You can now set private or public access for files uploaded to Retool Storage. Each file in your Retool organization has a public URL that you can enable by making the file public.

Files uploaded to Retool Storage are private by default, and you can switch between private or public access at any time. When uploading files with a Retool Storage resource query, you can enable Make file public on upload to automatically make them public.

We're continuing to make performance improvements after recently upgrading to React 18. Update batching groups state updates together, rather than perform each one separately, to optimize performance. This results in a more responsive experience in Retool and faster page load times.

Enterprise plan organizations on Retool Cloud or with a self-hosted deployment running Retool 3.38 Edge or later can connect and send all audit log events to Datadog.

The new Linting and Performance tools, available within Debug Tools in the App IDE, provide additional methods for debugging and optimizing apps.

Linting​

Identify queries, code, and components that may affect app performance.

Performance​

View statistics related to app performance along with an overall performance score. This is a useful tool for measuring how changes affect an app's performance and provides guidance on how to optimize it further.

Retool Forms is the fastest way to build a form on top of your database, your data warehouse, or wherever else you want your data. Retool Forms are:

• Native to your data source: Generating a form on top of any SQL datastore (Postgres, MySQL, Snowflake, etc.) in one click.
• Your form, your database: Use your own or we’ll give you a Postgres DB—with a connection string if you want to take it elsewhere.
• Code-first: You can write JavaScript almost anywhere, including libraries like moment and lodash, for custom validations, conditional logic, and data parsing.
• The start of other processes: Build apps and workflows on top of your data to join data sources, send updates through Slack or email, and take action on your results.
• Secure: Forms are public but the data, apps, and workflows you build are permissioned securely with granular access controls. You can also self-host it in your own VPC.

Retool Forms is free and has no arbitrary limits on users, forms, or submissions.

You can create custom URLs for web apps to make them more discoverable and easier to share with end users. With a custom URL set, end users can access apps at {domain}/app/{custom-url} or {domain}/p/{custom-url} if it's a public app.

Retool Storage is a hosted blob store that allows you to upload and interact with your files without needing to configure an object store (e.g., S3, Azure File Storage). There is a 5 GB storage limit per organization, with a 40 MB limit on file size. Your browser may have settings that restrict this limit further.

Working with files has previously been a challenge for users as it required storing base64 strings or using third-party data stores. Retool Storage is a built-in solution that requires no configuration.

There are two ways to interact with Retool Storage:

• The Retool Storage section in the Resources tab for your organization.
• The Retool Storage resource, available in both apps and workflows.

You can programmatically upload, read, and download from Retool Storage.