The document was sent to me in an email.

From what I can tell in tabbing through the open pages it looks like the pdf is inside a cluster, one pages of several.

I had a similar problem a few years ago. It turned out that the pdf's were locked in an Adobe bundle. I do not have that product.

Is there some way I can confirm that is what I seem to again be facing, a protected bundle?

BTW I can open the doc with Firefox. A saved copy will not open.
Likewise a screenshot pdf will not open but an image one did. I was able send a copy to a printer.

I tried to split the docs with PDF24 but that did not work either.

Is there any way I can take a look at the other docs in the bundle?

Is such splitting hopeless without Adobe?

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I am having the same problem with other pdf files
One screen comes up with at "can't reach this box.

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These are thing I tried first
Hmm, we can't reach this page error in Microsoft Edge [SOLVED] - Troubleshooter
Way nervous about changing register settings.
So next went here. Hmm, we can't reach this page error in Microsoft Edge [SOLVED] - Troubleshooter

I went into the setting and reset Edge and also deleted the file that I think set off the error.

Edge seems to be working okay now.

PDF opens in EDGE buf Edge Refuse to let me view it.-image.jpg