Extension Manager - upload extension file

[luckedea]

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Platform

All

Describe the enhancement you'd like

Use case

Extension Manager is an easy way to manage extensions supported by developers, but many users still want to install their own extension - this is supported by nzbget, but it means uploading the files into script folders while often it's not easily available (docker, remote hardware, etc).

Suggested solution

Please implement a way to upload an extension from local disk using browser from the EM interface.
Very handy for development and testing purposes, but may be helpful to users too.

Extra information

No response