Hey there @Thanosrom! Moving any assets outside of the editor can cause issues with the content registry not knowing where they are, which in turn makes them disappear or need redirectors. It’s recommended if you have to move assets within the editor to avoid this, but I do understand that large/many assets at once take more time, but the reason for this is that UE is handling content locations in the content registry constantly and is necessary for operation.
In many cases it does “just work” when you drag things outside of editor, but it’s more the exception than the rule in situations like this. If needed, gradually change folders over as you import more assets to reduce your overhead.