Error displaying .pdf in google drive

In the last few days I'm having a problem viewing .pdf files uploaded to Google Drive. During the design phase of the app I connect the link of the shared folder of Google Drive within the "web viewer" of the app, it has always worked but these days I get this message "unable to preview the google drive file error loading multiple pages ".
Anyone have a solution?

It is not a global thing, as viewing pdfs on google drive is working OK here.

You say:

do you mean you set the url to the link of the pdf file ? e.g.
or just

I read your deleted post, this could be a network connection issue, do you have good network? Are you using wifi or data connection (if data this could be the issue)

I entered the url of a folder created on Google Drive, inside this folder there are several .pdf files
The url is like what you wrote in the previous comment.

I specify that the same app worked perfectly a few weeks ago

I wrote wrong, I deleted and wrote well