One of the more frustrating things to happen online is when you try to do something that worked but now does not. A perfect example of this is opening an attachment to an email rather than downloading it first.
We found different browsers have different settings when trying to open an attachment. In Chrome, you may be able to open the attachment by changing an option in Settings. Click the three dots in the upper right corner, select Settings and then scroll to the bottom of the page and click Advanced. Look for the Downloads section and make sure the option to Ask where to save each file before downloading is unchecked. Try again. If still unable to open the attachment without downloading it first, try another browser.
In this case, using Microsoft Edge allowed you to Open or Save the attachment. This solved the issue, however, changing browsers was necessary.