So you have them in the folder above.
How did you get them there and what format are they?
Do you have auto analyse on?
If you leave it for sometime and come back are they there?
What format are the files you’re transferring apple files specific to an itunes ID for example won’t work.
Also something I learned as transfers and things were taking some time. Transfer one and see what happens. It may just be a delay that Engine is busy.