Here are some of the most common culprits to consider: Your laptop doesn't have a PDF reader installed. Your PDF reader or preferred program is out of date and needs an update. Your PDF application is potentially damaged or needs to be rebooted.
Source : https://www.adobe.com/acrobat/hub/why-pdfs-will-not-open.html
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
On your iPhone, open the Photos app and go to the Albums tab. Look for the Recently Deleted" album
Source : https://discussions.apple.com/thread/255373557
Select Privacy and security under advanced settings. Select Site Settings on the list of options on the right. On the PDF documents menu, toggle the slider Off next to Download PDF files instead of automatically opening them in Chrome to allow Chrome to automatically open PDF documents upon downloading them.
Source : https://www.microcenter.com/tech_center/article/11367/how-to-automatically-open-pdfs-in-google-chrome
Open File Explorer and click on File > Options in the top-left corner. If your mouse is giving you problems, you can still access File Explorer Folder Options. Press the Windows Key + E to open File Explorer.
Source : https://m.majorgeeks.com/content/page/open_folder_options.html
To find the My Files folder, search using the app search or in the default Samsung folder on your apps screen. My Files sorts your files into categories, such as Images, Videos, Audio and Downloads. If you have recently downloaded a file and are trying to locate it, tap Downloads" to access or delete the file."
Source : https://www.samsung.com/uk/support/mobile-devices/how-to-use-my-files/