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Unlike on desktop, you can only download a Google Doc file as a PDF on an Android. If you'd rather keep the Google Doc in an editable state, you can make it available offline instead: Open Google Drive and sign in if necessary. Tap in the bottom-right corner of the Google Doc file. Tap the grey "Available offline" switch. Tap the Google Drive app icon, which resembles a green, yellow, and blue triangle on a white background. This will open your Google Drive page if you're logged into your Google Account. If you aren't logged into Google Drive, select your account (or enter your email address) and enter your password before proceeding. Scroll through your Google Drive home page until you find the file. It's in the bottom-right corner of the file. A drop-down menu will appear. You can also long-press the file's thumbnail and then skip to the next step. It's in the drop-down menu. If you long-pressed the document's thumbnail, this option will appear at the bottom of the screen. If this is your first time downloading files from Google Drive onto your Android, you'll be prompted to allow it to access your Android's files. Swipe down from the top of the screen, then tap the downloaded Google Docs file's name in the resulting menu. This will open the file in your Android's default PDF viewer. On some Androids, you may first have to download Adobe Acrobat to view the PDF. You can also find your file in your Android's "Download" folder, which can be accessed by opening your Android's file manager app, selecting the location in which downloads are saved (e.g., the SD card), and tapping the Download folder.
Understand the limitations. Open Google Drive. Find the Google Doc file you want to download. Tap . Tap Download. Tap ALLOW if prompted. Open your file on your Android.