If the video has not been downloaded yet, tap the download icon on the video thumbnail within the chat [1].
The file is usually saved in Internal Storage > WhatsApp > Media > WhatsApp Video . Download File VID-20221015-WA0138.mp4
Go to your phone's Gallery or Photos app, find the "WhatsApp Video" folder, and look for the file by name [1]. If the video has not been downloaded yet,
Search for the filename using a File Manager app on Android. 2. Downloading/Saving the File find the "WhatsApp Video" folder
If you received the file via another medium (email, cloud link), click the download or save button. 3. Locating the Downloaded File