The file cannot be saved because it is read-only and belongs to the problem of file permissions. Right-click the property in the list box, and you can see whether the file belongs to read-only file from the file properties. Read-only file means that the file cannot be saved because it has no permission to modify, so all users need to do is to change the file and make it modifiable. The specific steps are to remove the read-only option, click Apply, and then click OK. Then open the file again and the modified file should be saved. Users can also copy the contents of the file, create a new folder, paste it into it, click Save, and select a save location.

It should be noted that if the user can see that the file belongs to a read-only file in the file property bar, but the read-only file cannot be deleted, and there is no hidden option, perhaps the user does not have the permission to modify the file, then the user can log in to the computer administrator to try to modify the file permission, and then the operation should be feasible.