Are the plugins made by Osimis compatible with the Qnap's version of Orthanc?

I was wondering if I could add the plugins to Qna’s orthanc, more specifically if I could use the web viewer since Qnap’s version is rather basic

Hello,

Neither the Orthanc project, nor Osimis are the maintainers of the Orthanc package for QNAP.

Please get in touch with QNAP’s support team.

For reference, the source code of the Osimis Web viewer is available at:
https://bitbucket.org/osimis/osimis-webviewer-plugin

Regards,
Sébastien-