Health Check plugin failed to deploy

Dears,

when I try to install the health check plugin in the _admin\\plugins I get the following error :

[Appian Plugin Hot Deploy] ERROR com.appiancorp.plugins.LoggingPluginEventListener - Failed to load Plug-in 'appian-health-check-plugin-4.8.0.jar' (appian-health-check-plugin-4.8.0.jar) version 0.0: 'Cannot open JAR file for reading: xxx\\_admin\\plugins\\appian-health-check-plugin-4.8.0.jar'

I see that the plugin is compatible with the current appian version we are using. Does anyone knows what is going on ?
Can it be that I copy paste the jar file through remote connection window ?

OriginalPostID-243035