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After update to UI 4.0 in my Galaxy S21 Ultra I have exactly the same problem with dual WhatsApp - cannot send nor receive voice messages, nor photos. For the moment I went to WhatsApp Business. What a *****!
Having the same issue on my 21 Ultra with UI 4.0. Decided to install WA Business and deactivate Dual Messenger for the time being. Disappointed.
I am facing the identical issues with the dual wats app post updating the software to One UI4 on my Samsung S21+ on 29.11.2021. The 01.12.2021 update too of no use. Unable to download files or send files on the dual app. Even on the facebook app the links are not opening and upon clicking the link the app crashes.
I dont know how many other issues will be faced in future which I have not yet identified.
I have exactly the same Situation. Everything was working fine before the Update to Android 12 / One UI 4.0. Now the second instance of whatsapp is receiving media but not able to download it.
Also check the facebook app; now the links of webpages and other app say amazon are either not opening or after opening the app crashes and closes down on it own. This is what is happening in my case along with the wats app issue
I don't think you can then revert back to normal WhatsApp, your details in WhatsApp Business account will be wiped off..
Will wait for Samsung to update in another 2 weeks, otherwise may consider trade in s21 Ultra for iPhone 13 Pro.. sad that Samsung put me down on this.. I'm missing out a lot of personal messages from family and close friends
Uninstaller the dual app and enable again from settings this will solve the issue. But the chats may be lost. This is because Samsung has changed the location on storage for dual messenger apps.