If your launcher doesn’t allow you to change folder icons natively, I suggest to use a narrow widget instead. See detailed steps on how
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Allow to show popups, even when the app’s main window was not opened by the user.
When you import a backed up bookmark cloud, it will appear in the “Widgets&Folders” section as an “Imported bubble cloud”…
Basic usage tips for Bubble Cloud for phones and tablets
“Accidental push alert” and new expert options ► Phone app fully Android Pie/Oreo compliant! ► Mandatory Oreo notifications: see how to hide them