To access files in the File app on your iPhone, iPad, or iPod touch, follow these steps:
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Open the File app on your device. If you don’t see the blue File app icon on your Home screen, swipe down and search for the File app.
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In the File app, either search for a specific file or browse through the files until you find the one you want.
There could be several reasons why you are unable to open PDFs. It could be due to an improper installation or update of Acrobat or Reader, or it could be because you are using an outdated version of the program. To resolve this issue, you need to update Acrobat or Reader to the latest available version. You can download the latest version from the official Adobe website.
If you are unable to download a file, it may be because you don’t have permission to download it from the server. To resolve this issue, try searching for the file on a different website or contact the website or server owner. It means that you don’t have permission to download the file.
For all Windows users:
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Right-click on the PDF file and select "Open with."
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Choose Adobe Acrobat Reader DC or Adobe Acrobat DC from the list of programs.
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Click OK to open the blocked PDF file.
To open files on your mobile phone, you can use Google Drive. In addition to storing any type of file you want, Google Drive can read a wide range of formats, making it particularly suitable for documents like DOCX and PDF. WPS Office is an acceptable alternative.
Here is a possible translation of the answer in Italian, using the same words as the original but trying to modify the possible order and correcting any errors:
Shortly before, I can tell you about Files by Google, an application that is preinstalled on most Android devices through the Play Store and Google services. This file manager allows you to view all the files in the various system folders, copy them, move them, rename them, and many other features.
To find a PDF document on the internet, write the name of the document after the word "filetype: pdf" and leave a space between them.
In the top right corner of the page, click on the gear-shaped icon. Then, click on Advanced Search. You can choose different filters, such as language, geographic area, last update, and file type. This is exactly what we are interested in. The question is also: How can I find a format using Google? Search for the file type on Google.
Use the filetype: operator and the file extension, which can be three letters like PDF, DOC, XLS, or PPT. With this, you can narrow down the search within a website. The search operator is capable of finding files on a website.
The certificate can be viewed, downloaded, and printed on the dedicated website, or you can download the Immuni or IO app. In applications like Immuni and IO, it is visible if you already have the Super Green Pass.