Without knowing anything about the digital environment of laptops and PCs, I can only guess.
Is a Bitlocker installed in any laptop or PC?
Are the copied files stored in OneDrive/Sharepoint?
Do you get any message or window when trying to open the files?
Could you add some pictures or the file (without sensitive data) with the problem itself?
Here is some general information:
Fix problems opening documents in SharePoint libraries
Fix problems uploading files on the OneDrive website
Thank you for your understanding and patience
I know I don't know anything (Socrates)