Please make sure your browser is not blocking popup windows, here is how.
Also, here are the things to try when you have missing files:
- Make sure you are logged into the correct account and also check any other accounts you may have. It’s easy for most of us to lose track of what we have where.
- Make sure you check for the file from Drive in each account, you will have better luck locating files in that interface than in the Sheets or Docs, or Slides interfaces. And make sure to check the trash there too.
As an alternative solution, you may download the templates in PowerPoint format and then open the PPTX files in Google Slides from your local drive.