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As the title says, I would like to block an image upload that is smaller than 200x200px.
Alternatively, I would like to now allow a user to set images smaller than 200×200 as the main image to a post.
I have searched for countless hours and I have found nothing, any help is greatly appreciated.
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How much have you written PHP code before?
Fairly easily Googleable, eg https://www.google.com/search?q=how+to+limit+image+dimensions+uploaded+to+wordpress+code
returns https://wordpress.stackexchange.com/a/130204/45768
I’m pretty sure this is now a default feature with ACF