iPhones can't open greyed files. When an iPhone can't open a specific file type, it greys out the file in your selector, making it unclickable. This will happen if you don't have the right viewing software downloaded to your device. The most common type of greyed-out file on iPhone is a PDF.
Source : https://www.adobe.com/acrobat/hub/why-pdf-files-are-grey-iphone.html
SnapTube. SnapTube is another popular app that allows you to download YouTube Premium videos. It's available for Android and iOS devices and can download videos in various resolutions and formats.Mar 25, 2023
Source : https://www.linkedin.com/pulse/would-you-like-download-youtube-premium-videos-free-charlee-alivia
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Source : https://www.youtube.com/watch?v=gMYvCEFmZvM
How can I make chrome open a file without downloading it on the...Click the 3 dot menu at the top right of Chrome.Click Downloads in the sidebar.Turn off the toggle for Ask where to save each file before downloading".Feb 10
Source : https://support.google.com/chrome/thread/201301180/how-can-i-make-chrome-open-a-file-without-downloading-it-on-the-device?hl=en
Download an attachmentOn your computer, go to Gmail.Open a message.At the bottom of the message, hover over the attachment.Click Download .
Source : https://support.google.com/mail/answer/30719?hl=en&co=GENIE.Platform%3DDesktop
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