By default, Slack downloads files directly to your computer's standard folder . However, the specific behavior and your ability to change this location depend heavily on whether you are using the desktop app (direct download vs. App Store version), a web browser, or the mobile app. Default Download Locations by Platform
Files typically land in your user profile's Downloads folder.
Slack follows your browser's specific settings. For example, if you use Google Chrome or Microsoft Edge , the file will go to the destination defined in those browsers' settings.
This customization option is generally only available if you downloaded Slack directly from the Slack website. If you installed it via the Mac App Store or Windows Store , you may not see the option to change the path due to app sandboxing restrictions. Troubleshooting: Where Did My File Go? If you’ve downloaded a file but can't find it: Manage your default download location | Slack
Files are usually saved to your device's local storage (e.g., the Files app on iPhone or the Downloads folder in Android's file manager) after you tap the "Download" option from the file menu. How to Change the Download Location