This post fromMiniToolintroduces how to fix the OneDrive upload button missing issue.
The following is a related forum from Microsoft:
Why is the OneDrive upload button missing?
This post introduces how to fix the issue.
ChooseMore Toolsand chooseClear browsing data….
3.
To delete your entire browsing history, click theTime rangedrop-down menu to select theAll timeoption and check theBrowsing historyoption.
Then, clickClear data.
Also see:How to Delete Your Search History in Chrome, Firefox, and Edge?
TypeCommand Promptin the Search bar and selectRun as administrator.
Launch any Office program like Word, Excel, or PowerPoint.
Sign your account in the Office utility.
Go to theSavecategory and uncheckSave AutoRecover information every * minutes.
it’s possible for you to give a shot to reinstall OneDrive.
Press theWindows+Ikeys together to launchSettingsand choose theAppsoption.
Under theApps & featuresoption, scroll down to findMicrosoft OneDrive.
Then, clickMicrosoft OneDriveand click theUninstallbutton.
Go to theMicrosoft official websiteto download and reinstall OneDrive.
OneDrive allows you to sync files to the cloud.
This post tells you how to schedule a weekly backup to OneDrive.
I believe that one of them can be helpful for you.
You just need to try them one by one.
