search 999 in the "My files" app, enter the 999 folder and then android-media-com.whatsapp folder
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Thanks, I managed to copy across. However after transferring from the old phone, the filename needs to be rename, to add ending with 'dot'. It is missing the dot when receiving the file over oppo share transfer. So it is a bit tedious to rename a lot of files... not sure if I've done something wrong. But in the end after renaming it works, the WA chat can recognise all the documents I sent previously.