Some users report that they meet the file upload not implemented issue when opening a Word file.
Fix 1: Repair Microsoft Office
Microsoft provides a built-in repair tool to repair Office.
Step 1: TypeControl Panelin theSearchbox.
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Step 2: Click theUninstall a programbutton underPrograms.
Step 3: Find and right-smack the Office program to selectChange.
Step 4: ChooseQuick RepairorOnline Repairbased on your needs.

Then, follow the on-screen instructions to finish.
you might launch Word in Safe Mode and see if the problem goes away.
Step 1: PressWindows+Rto openRun.

Step 2: Go toFile > Options.
Step 3: ClickAdd-insand clickGo….
Step 4: Select any add-ins that appear in the list, and clickRemove.

The update process will fix some bugs, which may include file upload not implemented.
Step 1: Open a Word file and choose theFileoption in the upper right corner.
Step 2: SelectAccountand you’re able to findUpdate Optionson the right pane.

Step 3: punch theUpdate Optionsbutton, then chooseUpdate Nowto upgrade Microsoft Word.
Step 1: TypeControl Panelin theSearchbox to open it.
Step 2: Then, clickPrograms and Features.
in case you find the same issue, it’s possible for you to try the methods mentioned above.