PDF previewer in Outlook?

have been searching for a solution to this for the past few days - I can't preview pdf documents in Outlook as a "previewer isn't installed". I've installed xodo and SumatraPDF ,Omegle Link Removed https://pnrstatus.vip/ but neither of them seem to work with Outlook. Does this mean I have to install Acrobat Reader? There are solutions which require changing a regedit key, but I haven't been able to find any of the listed keys on my system. I'm using Windows 10 home edition on a Surface Pro 6 with Office 365 made available through my workplace. Thanks!