I was using pdf viewer with PowerApps.
Earlier, I tried to use the url to convert the thumbnails of the gallery control to pdf, and when I put it into Document, it showed up at first, but then stopped showing up.(https://masteroffice365.com/viewing-word-powerpoint-and-html-files-from-sharepoint-within-powerapps/)
Not only that, but the ones that used to be able to be displayed are no longer able to be displayed.
I couldn't see the sample document "https://blog.mozilla.org/security/files/2015/05/HTTPS-FAQ.pdf" or even "SamplePdf" anymore.
There is no error message, just nothing.
How can I use the pdf viewer like before?