My phone couldn't download image in Whatsapp if using Wi-Fi
Appear error on my phone "Couldn't download image. Try again. If the problem keeps happening, try off Wi-Fi or VPN, or connecting to a different Wi-Fi network.
iPhone 6 Plus, iOS 11.4.1
Does it happen only with 1 image or... always?
if only 1 image, that could be corrupted or too large.
if always, have you checked WhatsApp settings? (data and archive)?
if nothing helps, contact Whatsapp support team.
Regards
Giulio