On Android devices, you use the Gmail app to save video attachments. and select the relevant email. Locate the attachment at the bottom of the message.
over the video attachment. You will see several icons appear.
(a downward-pointing arrow). The file will automatically save to your computer's default "Downloads" folder.
(downward arrow) on the attachment card.
For iOS users, the process involves saving the file to your device's storage or "Photos" app. Open & download attachments in Gmail - iPhone & iPad