In "Settings" -> "Process" -> "Preview" -> enable option "Prefer provider preview file and don't generate preview".
In "Settings" -> "Process" -> "Preview" -> down below (last option): "If using preview file prefer image which has name has text" -> by default it's set to "preview", so your image file must have word "preview" anywhere in filename. You can change that or leave it empty (if left empty = first image will be used).
PM me if you need more help.
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