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Are there any "official" S3 plugin for NodeBB? there are loads of unmaintained forks of S3 plugins which is quite concerning...
The one by LouiseMcMahon is the fork which I usually recommend, but if it is incompatible, let us know and maybe we can fork it into the NodeBB-Community org.
As an aside, I also just discovered https://github.com/zhivkoangelov/nodebb-plugin-s3-uploads-digitalocean by @zhivkoangelov... that one seems maintained, but it uses DO Spaces as a backend.
Given that DO spaces is "S3-compatible" maybe this will work with S3 who knows.,