Adobe Acrobat combine not working for Word Docs on Microsoft OneDrive

You're very welcome  @Alan285637408198 .

Long reply, please bear with me,

My initial reply didn't came out right, I should've explain why I suggested  clearing the credential manager cache.

I've suggested to clear the credential manager cache not because of suspecting that something could be  wrong with the PDFs that are currently saved in a OneDrive cloud space.

I was implying how the Microsoft Windows operating system seems to break the FileSyncing process.

This recommendation is an actual official Microsoft Support guidance that I found in their support forums outside of Adobe's; it has  helped me resolve this issue in my own computers and a few other Sharepoint and Office 365  users. 

The link below offers the same results as clearing the credential manager cache:

• https://helpdeskgeek.com/office-tips/10-ways-to-stop-onedrive-from-syncing/

Sometimes clearing or resetting the credential manager cache is not enough, for which signing out and back in with the OneDrive app may be a necessary step too.

I think that many users keep confusing the notion of how Adobe Acrobat interfaces with third-party online cloud services (other than the Adobe Document Cloud itself),  as if it is a physical drive location when in fact there so many other bits and pieces involved).

Prime example, everyone seems to miss what is the operating system doing in the background ?

I only read Acrobat and OneDrive... 

I usually never see the users concerned with how the Windows operating system handles that part of the cloud networking  integration.

So, the issue that I was trying to rule out is what takes place virtually between the cloud service and the actual local folder where these OneDrive files are temporarily cached in your personal computer (managed entirely by the OS, not the hosting apps like Acrobat and OneDrive).

In other words, it would make sense to me to understand how are the files synchronized and  managed between the operating system and the OneDrive app. Which is entirely different than how the same file is handled by the Adobe Acrobat as the host program.

Example of Acrobat categories that may be affecting how files are synced on real-time:

• Edit => Preferences => Documents  => "Save As optimizes for Fast Webiew" (downloads in the background one page at a time while the user scrolls up or down in that document (not the same as working with full offline copy of a PDF)

• Edit => Preferences => Adobe Online Services  => "Sync preferences accross devices and document services" (is it necessary having this preference enabled when working with OneDrive ?)

• Edit => Preferences => Internet => "Allow fast web view" and "Allow speculative downloading in the background" (if enabled, can this be causing a conflict with how OneDrive filesynces?)

• Edit => Preferences =>  => Sandbox Protections ( "Protected View amd Enhanced Security enabled)

But anyhow, because not all cloud services work in the same way, I am under the assumption that the cached (or offline) copies of your PDFs are partially updated as you are viewing them in Adobe Acrobat; this is where the file syncing breaks.

Some cloud services will make an full offline copy of the PDF file available in your local computer hard drive every time it is synced to/from the cloud.

While other cloud services will add blocks of the file's data to update the offline copy  with the most recent file changes only (happens everytime your computer goes online, not when it is offline... of course); also referred to as block syncing.

So, if you confirm that you already tested by clearing the credential manager cache and it didn't resolved the issue, it would help me narrow down the issue to other areas and refrain from suggesting this speculative guidance to other users.

.