To change the default app for a specific file type or action, follow these steps:Open the Settings app.Tap Apps & notifications.Tap Advanced.Tap Default apps.Tap the file type or action you want to change the default app for.Select the app you want to use as the default.Sep 27, 2023
Source : https://www.gizchina.com/2023/09/27/how-to-change-default-app-settings-on-android-solving-file-format-issues/
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Source : https://m.youtube.com/watch?v=Yoc2NRM8SB0
How to download YouTube videos using the official app. The YouTube app for Android and iOS allows users to download videos for offline viewing, provided the video is not private and the creator allows it.Jan 23, 2020
Source : https://www.gadgets360.com/internet/features/how-to-download-youtube-videos-for-offline-viewing-1831870
FDM, a free download manager, continues to evolve.
Source : https://www.freedownloadmanager.org/
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
To find and view videos that you've downloaded on your Android device,Sign in to your Premium account from the YouTube App.Tap your profile picture.Select Downloads from the list of options.
Source : https://support.google.com/youtube/answer/11977233?hl=en&co=GENIE.Platform%3DAndroid