Are PDF reports from Reporting plugin saved somewhere in the backend?

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser): OpenSearch 2.6.0

Describe the issue:

I have been trying to find in the Linux system where I have OpenSearch running the reports generated from the Reporting plugin but I have not been able to find them, are these reports generated on the fly and then removed?

Yes, the reports are generated on the fly by the frontend code, once the reports are generated successfully, the browser will download them directly and they will not be saved in backend.

Thanks for confirming it,
is there any simple option to have them saved on the backend? without too many tweaks involved?

It’s not easy to store the report files into OpenSearch, maybe you can try to use reporting cli tool and write some code to store the generated files into AWS S3.