I've done exactly that: created folders for each, put file in them, under Construct2-Win32 Plugins and Behaviors, and I've made sure I put plugins in Plugins and behaviors in Behaviors. But I get this error report for each of the five plugins/behaviors:
Unable to load plugin in C:\ProgramFiles\Steam\steamapps\Common\Construct2\Construct2-Win32\exporters\html5\plugins\New Folder
Cannot open file <insert what I typed above>... \New Folder\common.js
This plugin will not be available in the editor.