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Open Google Drive. Tap ＋. Tap Upload. Select an upload option. Select files to upload. Tap UPLOAD. Wait for your files to upload.
Tap the Google Drive app icon, which resembles the triangular Drive logo on a white background. This will open your Drive page if you're logged in.  If you aren't logged in, enter your email address and password before proceeding. If you haven't yet downloaded Google Drive, you can do so for free from the iPhone's App Store or your Android's Google Play Store. It's in the lower-right corner of the screen. A pop-up menu will appear. This option is in the pop-up menu. Depending on whether you're using an iPhone or an Android, you'll have slightly different upload options available:   iPhone - Tap Photos and Videos to select photos and/or videos from your Photos app, or tap Browse to select files from the Files app.  Android - Select a file location in the resulting menu. You should see at least an Images and a Videos option here. Tap and hold a file to select it, then tap other files to select them as well. On an iPhone, some files will upload immediately after being tapped. It's in the upper-right corner of the screen. Your selected file(s) will begin uploading to Google Drive. The amount of time this takes will vary depending on the size of the upload and your Internet connection.  Do not close the Google Drive app during this time. Once the files finish uploading, you'll be able to access them from Google Drive on any Internet-connected computer or smartphone.