If you want to enable PDF viewer in Outlook, go to the File" option and click the "Options" button. After that
Source : https://updf.com/knowledge/cannot-open-pdf-in-outlook/
Swipe left past all your Home Screen pages to see App Library, where your apps are organized by category. To open an app, tap its icon. To return to App Library, swipe up from the bottom edge of the screen (on an iPhone with Face ID) or press the Home button (on an iPhone with a Home button).
Source : https://support.apple.com/guide/iphone/open-apps-iphca3d8b4e3/ios
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
Pictorial representation of the above settings are as follows :1 Open Setting" from app screen.2 Tap on "Apps".3 Tap on "three dots" on the top right corner of the screen.4 Select "Show System Apps".5 Search for "Download manager"6 Tap on "Enable" option.Oct 12
Source : https://www.samsung.com/in/support/mobile-devices/how-to-enable-download-manager-application-in-samsung-galaxy-grand/
On the Start menu, select Settings > Apps > Default apps.Select which default you want to set, and then choose the app. You can also get new apps in Microsoft Store. ... You may want your .pdf files, or email, or music to automatically open using an app other than the one provided by Microsoft.
Source : https://support.microsoft.com/en-us/windows/change-default-programs-in-windows-e5d82cad-17d1-c53b-3505-f10a32e1894d
Ctrl+R is a keyboard shortcut that is commonly used in web browsers to reload the current webpage. It's a quick way to refresh the page if something isn't loading correctly or if you want to see any updates that may have been made since you last visited.
Source : https://www.lenovo.com/us/outletus/en/glossary/ctrl-r/