Hi Zelles,
Yes, there is a Discord server available—you can find the link on our front page.
The Tiled Plugin also includes sample projects that demonstrate its features and how to set it up. The FAQ addresses your specific issue in detail. You can view it here:
https://visustella.itch.io/tiledpluginmz/devlog/371284/tiled-plugin-faq
Furthermore, our tilesets are formatted for RPG Maker MV/MZ and are fully compatible with the vanilla engine. The Tiled Plugin is entirely optional and was created for developers who want more control and flexibility over their mapping process.
Additionally, please note that the version of Tiled you are using is important—especially for RPG Maker MV. Tiled MV will not work if your Tiled version is above 1.3.0 and will cause the issue you're experiencing. RPG Maker MZ should not have this limitation. In your case, it sounds like there may be a problem with the JSON and PNG files not being properly set up, or the map file itself may be missing.