But the problem is when somebody send any mail with zip attachment like image file or document file the zip folder can not save or download in android. If you try to click on downloading attachment it will warn you to that can not be saved the file due to malicious virus or untrusted file.
So in this case if you like to save or download attachment from your android, you have to install another app is called k-9 mail app.
Save or download Gmail Zip attachment from android mobile
1.Go to google play and install k-9 mail app its free
2. go to gmail with password and user name
3. after install allow this program to sync with gmail
4.If it will finish sync, you Can proceed to download zip attachment from gmail
I love to use k-9 mail app for download and save file which is comes with gmail attachment in zip format.
For your ease you can set disable auto sync option. So that you can save space.