First, if you have single click activated do this: -
Try this: -
After you have searched for the files & you can see the results, when the mouse "hovers" over a file name it will select that item. To select one more item press Ctrl and move the mouse to the nextfile name. Add further files in the same way.
If you want to select a "bunch of files" in a consecutive sequence, select the first file, then press shift & then move the mouse to the last file in that sequence. This will select all files between the first file & last one.
If you have double click activated: -
Carry out the above procedure in the same way but instead of "Hovering the mouse" you will need to click the mouse to select the file name.
Multiple files are selected in the same way with Ctrl & shift.
Please note: -
If you start moving files around the system could get confused as certain files are expected to be in certain places. Also media playing software, photo packages & office packages will also expect the same file to be where it last saved it.
So, if you move a movie or a document etc. the media player file location & file storage data
(Media library) will be wrong & therefore this could give problems when you try to play a music file or film etc. & that is because you have moved the file to a new location which is different to the one in it's library.
I hope this is clear enough foryou to follow.