We are sorry for the inconveniences! This issue (via Cradle task or directly on our website) may occur when dealing with large plugin archives that take more time to upload. While the actual upload may complete successfully on the Marketplace side, the Gradle task publishPlugin might still encounter a timeout (504 Gateway Time-out).
We are actively working on improving our system to better handle such scenarios. In the meantime, we recommend the following steps:
Try running the upload task again if the upload fails.
Consider reducing the size of your plugin archive, as smaller archives are less likely to encounter time-out issues.