I understand you're experiencing an "Error uploading carousel image: unknown error" when trying to upload a carousel image while publishing your plugin.
To help us understand what might be happening, we'd appreciate a few more details:
Is this your first time trying to publish this community resource? If you already have a community plugin page for it, could you please share the URL?
Could you please double-check the recommended dimensions for images and icons in our guide? You can find that information here: Prepare plugin information
Also, just to be sure, please try our "Check network settings" quick action. Here's a guide on how to do that: Adjust your network settings
Once we have this information, I'll be happy to escalate this to our team for further investigation.