Reason 1: Many Android devices do not have a built-in feature for opening a PDF file. So you cannot open it. Reason 2: Your PDF files are corrupted. Many reasons can cause the corruption of PDF files, like virus attacks or hardware damage.Jan 10, 2024
Source : https://updf.com/mobile-app/how-to-open-pdf-files-on-android/
In the Books app , you can open and save PDFs that you receive in Mail, Messages, and other apps.
Source : https://support.apple.com/guide/iphone/read-pdfs-iphab2193d5/ios
Use the Files app to manage your files.Mar 13, 2024
Source : https://support.apple.com/en-us/102570
On your computer, open Chrome. Downloads. To open a file, click its name. It will open in your computer's default application for the file type.
Source : https://support.google.com/chrome/answer/95759?hl=en&co=GENIE.Platform%3DDesktop
Older or specialized formats might not work as expected if your device, its operating system, or the app you're using to view or play the file doesn't support the file's format. Install all available Apple software updates for your device, such as updates for your Mac or updates for your iPhone or iPad.
Source : https://support.apple.com/en-us/102644
PDFescape offers ample annotation tools. You can use the app to fill out forms, create form fields, insert text and web links, highlight text, add sticky notes, redact or strike out text, crop and rotate images, add or remove pages and even lock and encrypt PDF documents.Apr 17, 2024
Source : https://www.tomsguide.com/best-picks/best-free-pdf-editors