I think that you should be able to have a forge download option, and when you select that, you should be able to uplod your own zip files of plugins and mods.
Uploading Your Own Plugins And Mods
- brightstar
- Closed
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.
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There is a separate forums section for English users.
We can't allow you to upload your own plugins and mods due to security related reasons.