Never messed with UAC on recent windows.   My general experience is when you have trouble copying files, it's due to who has ownership of the folder.  You need ownership to set the permissions.  The popup about "your organization" sounds like you are on pro/enterprise and there's something in group policy that's blocking.

 

scott s.

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Thanks Scott

How do I find out who has ownership of a folder or even a drive?

36 minutes ago, Jarnie said:

How do I find out who has ownership of a folder

Right-click the folder or file and click “Properties” in the context menu. Step 3 – Switch to “Security” tab and click “Advanced”. Step 4 – In the “Permissions” tab, you can see the permissions held by users over a particular file or folder.

Have you ever signed in to a work or school Microsoft 365 account on your PC? If you have, your Windows Pro PC might be enrolled on their 365 tenant. This is likely to apply Intune policies that will lock down the security on your PC.

If you don't use 365, or only the home version, then this won't happen.

Look at this article to check your PC if you're not sure. https://superuser.com/questions/1641950/what-is-access-work-or-school-in-windows

41 minutes ago, pete_auau said:

Right-click the folder or file and click “Properties” in the context menu. Step 3 – Switch to “Security” tab and click “Advanced”. Step 4 – In the “Permissions” tab, you can see the permissions held by users over a particular file or folder.

Thanks I have checked security on the folder for an aircraft and it displays FULL CONTROL. The same for the parent folder and also all the sub folders for that aircraft except for one sub folder which does not have the tab named security to select.

 

23 minutes ago, flyingscampi said:

Have you ever signed in to a work or school Microsoft 365 account on your PC? If you have, your Windows Pro PC might be enrolled on their 365 tenant.

Not that I can remember..