Microsoft Upload Center has disappeared completely

Open Start > Settings > Apps > Apps & features
Scroll down to Microsoft Office
Select it
Click Change

Now, wait while the repair wizard starts up.

Choose the type of repair you would like to perform. Depending on the severity or availability of your Internet connection, you could try the first option, Quick Repair, which is much faster and tries to fix the problem without a data connection.

If that doesnâ€:tm:t resolve the problem, then go back and try the Online Repair option. For my particular issue, I ultimately had to use the Online Repair.

The repair process is straight-forward following the wizard. Note that youâ€:tm:ll need to save your work and close all Office programs first, and then click Repair.

Then wait while the repair process runs.

You will notice the repair experience is similar to a fresh installation. The amount of time it takes will depend on your connection speed and what the issue is.

You will see your Office apps light up in their respective colors while the repair completes.

Once the installation is complete, restart your computer just to be sure and launch your apps and verify if the problem you were having is resolved.

or

Press Windows key + R
Type: C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Microsoft Office Tools
Hit Enter

Look if its there