Please do make the preview of pdf files possible again, it is really frustrating that I have to download pdf files so that I can review them.
This has been quiet for a while. I ran into this with IE (not Edge, Firefox or Chrome) but since we use IE 11 as a default browser, the fact that the SharePoint/OneDrive preview of a PDF in that browser forces you to download if you hit print is tedious. Users don't want the extra step of downloading or clicking on Open in browser to get the Adobe preview. This just causes confusion and erodes their confidence.
Since it seems to work everywhere else, how about figuring that out in IE as well?
Barry Prentiss commented
PDF Preview in Word Online is inadequate. Limited to sizes below ANSI E, which is common in Engineering enterprises. Please replace the with a capable preview tool, or allow client to determine application assignment for this task.
Yes - this new pdf previewer is terrible. It takes 3 extra steps now to open it in the browser as we did before.
I agree, just ran into this issue this week also. Please fix this.