How do I store my resume from my gmail account into iCloud Drive from my iPhone 6?

Click on the resume to open it, look for upload icon (bottom left), should bring up a pull up menu (from bottom) with options such as Add To Notes, Save PDF to iBooks, or Copy To Pages.

If you choose one of the three options above, you can then save, from there, to your iCloud Drive.

Good luck!

Hmmm, it could be saved to your Google Drive. If you scroll to the right on the top menu (from the menu that's brought up), press More, you will see what apps are toggled on. Perhaps Google Drive is toggled on and it may have saved there if it's not saved to your iCloud Drive.