If the file was deleted or the "Download" button in the chat shows an error (e.g., "Media not found"), you will need to ask the to send the video to you again.
Check your Photos app under the "WhatsApp" album or search for the date October 5, 2022. Request a Redelivery: Download VID 20221005 WA0014 mp4
Use a File Manager app and navigate to Internal Storage > Android > media > com.whatsapp > WhatsApp > Media > WhatsApp Video . Search for "20221005" to find the file. If the file was deleted or the "Download"