Run in PowerShell
Get-ChildItem -Path "C:\Path\To\Your\Folder\files\being\Blocked\" | Unblock-File ===============================This will remove mass file unblocks.
Save Unblock-Files-Gui.ps1 in a folder you can access
Right-click and choose Run with PowerShell, or:
Open PowerShell, navigate to where the script is saved, and run:
.\Unblock-Files-GUI.ps1
or
If files are Security blocked due to from another computer
Unlink OneDrive and sign back in