to be on the save site:
1. setup your own fileupload script, I like jQuery File Upload Plugin
2. let the script return a div-window including the link to the file
3. let the user copy this link into their posts.
Otherwise you can use free CKeditor scripts, such as: FileManager in CKEditor
or the commercial version: http://cksource.com/ckfinder
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April 20, 2021: Q2A 1.8.6 released!