I’m also studying the possibility to add a featured image for each site in a network!
Would love to know if there is way to achieve that with ACF, but I’m not sure, as ACF fields are not available in the network admin.
I found this plugin on GitHub: https://github.com/Frosty-Media/ms-featured-image
Maybe it’s worth a try.
Edit: it seems this plugin needs an update… got a fatal error after activation…
Edit 2: OK the fatal error is only displayed until you upload pictures for the sites.
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