WhatsApp stopped recognizing my camera and gallery on my Huawei Y9 2019 mobile, factory reset fixed it but the moment I selected the SD card as default storage, in settings on the mobile, the fault came back, setting default back to internal storage fixed it.
Hope this helps anybody with same problem because replies from Huawei just parroted the solutions that I told them I'd tried and when I reported my solution they suggested I use the solution I'd emailed to them, bloody cheek!
On another note, along with the WhatsApp problem I found that even with my file manager X-plore i couldn't delete a load of files which appeared in my download folder but now can. Still dont know if the original problems were down to selecting the SD card for storage or a dodgy update.