How to change thumbnails on WordPress (not the sizes)?

RoyDanino said:

I have a featured image (with text) on every post on my site. My theme shows text over the featured image on the home page (don't want to change that).
It creates a mess and it's barely readable. Is there a way to upload a version of the featured image, to be shown on the homepage instead of the thumbnail currently being auto-generated from the featured image? A plugin, maybe?

Thanks.

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