Sorry, I found later that real culrpit was other plugin like “Pay with Contact Form 7” error in which either was preventing enqueuing script for multiple files dropzone, or was disabling javascript for cf7 altogether. After I disactivated that plugin (I was seeing errors like nonexistent key in array in code from that plugin in nginx error file), dropzone for multiple files upload in cf7 contact form began to work normally.
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This reply was modified 2 years, 7 months ago by marinalan.
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This reply was modified 2 years, 7 months ago by marinalan.