Uploading pics from phone to Google Slides

I have looked it up online and most techniques for uploading a picture from your phone to a Google Drive app involved downloading Google Drive or the App (in this case Slides) on your phone. Everyone that I will be working with has a Google Drive account already so I want to know is there a way they can take a pic on their phone and share/email/text that photo onto their Drive and then they can work on their computers putting into their presentation.