Используйте приложение APKPure
Историческую версию Save my Attach можно получить на Android
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Save the GMail attachments to the SD-card. Tap on "Preview" button in the GMail and select "Save ..." from the list.
Works with Email app also (use "Open").
Please note: this app doesn't have a launch icon! You could open it only from your GMail app by tapping a "Preview" button