Gmail iOS app: What’s a work around to *save* all my deleted gmail messages?
Unless you indicate to actually delete emails in Gmail (or move them to Trash), it actually simply changes the tag on an email to the 'All mail' tag. (some apps, like Apple Mail, give you a button to move to Trash). In the Gmail all, go to settings and change the swipe action to 'Archive'. This will remove the message from view, but will move it to 'All mail'. You can go into the 'All mail' folder to see all these archived emails.