In Xcode-11.2.1
You might be see different pattern for uploading IPA
Steps:-
i) Add your apple developer id in xcode preference -> account
ii)Clean Build Folder :-
iii) Archive
iv) Tap on Distribute App
v) Choose Ad-hoc to distribute on designated device
6)Tricky part -> User can download app from company's website URL. Many of us might get stuck and start creating website url to upload ipa, which is not required. Simply write google website url with https. :)
7)Click on export and you get ipa.
8)Visit https://www.diawi.com/ & drag and drop ipa you have downloaded. & share the link to your client/user who want to test :)