Setup operation: Replace only qa-plugin/wysiwyg-editor/plugins/flash/dialogs/flash.js
I tested at Q2A V1.6.2. There is other method to add plugins such as iframe or source. UI is not good, but this method seems to match it to be equipped with old version CKEditor without weakening security in Q2A.
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April 20, 2021: Q2A 1.8.6 released!