Cannot Browse/Load Remote S3 Assets (Mautic 6.0.4) - Clicking Amazon S3 does nothing

Product Support
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Your software
My Mautic version is: 6.0.4
My PHP version is: NGINX
My Database type and version is: 8.1

Your problem
Hello Community,

I’m experiencing an issue with the “Browse Remote Files” feature for S3 in Mautic 6.0.4 and I can’t seem to find a solution.
Configuration:

  1. I have successfully configured the Plugin to use Amazon S3. New asset uploads are working correctly and are being saved to my bucket.

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The Problem:

When I try to add an existing asset from S3, I follow these steps:

  1. Go to Components > Assets > New.

  2. Click the dropdown arrow next to “Upload File” and select “Browse Remote Files”.

  3. The modal window opens correctly. In the left-hand pane, I see the “Amazon S3” option.

  4. The issue: When I click on “Amazon S3”, absolutely nothing happens. The right-hand pane does not update, it doesn’t show any folders or files, and it just stays on the default message (“Select the service on the left…”).

Here is a screenshot of the state where it gets stuck:

Troubleshooting Steps I’ve Already Taken:

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  • Cleared the Mautic cache multiple times (php bin/console cache:clear).

Any guidance on what logs to check or which configuration to verify would be greatly appreciated.

Thank you!