Find the PDF you want to open in your Files and double click to open. Select Adobe Acrobat (or whichever reader you downloaded) from the list of available options. If no list appears or the page opens in another application, you can right-click the file and select Open With to choose your PDF reader. Click Open.
Source : https://www.adobe.com/acrobat/hub/how-to-read-pdfs-on-pc.html
You can check if there's a new version available:On your Android phone or tablet, open the Play Store app. .At the top right, tap the profile icon.Tap Manage apps & device.Under Updates available
Source : https://support.google.com/chrome/answer/95414?hl=en&co=GENIE.Platform%3DAndroid
View your filesOn your Android device, open Files by Google .Tap a category. You'll see files from that category in a list.To change how the files display, tap Grid view . To go back to a list, tap List view .Optional: To sort your files, on the top right, tap More . Select Sort by.
Source : https://support.google.com/files/answer/9765314?hl=en
PDF files often need to be downloaded from the internet before they can be opened. Make sure you have enough storage space available on your device to download and open PDF files. If you have content blockers or ad-blockers enabled, they might interfere with downloading PDFs.
Source : https://discussions.apple.com/thread/255075729
Downloads.On your computer, open Chrome.At the top right, click More. Settings.Click Privacy and security. Site Settings.Click Additional permissions. Automatic downloads.Choose the option that you want as your default setting.
Source : https://support.google.com/chrome/answer/95759?hl=en&co=GENIE.Platform%3DDesktop
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Source : https://www.youtube.com/watch?v=JeAIJMaKlVY