In the old Google Drive you were able to hold down the Shift key and click on multiple folders that you wanted to organize your files into. In the new Google Drive this does not work.
Move to a Folder
Click once on a file to select the file in Google Drive. The more icon looks like 3 dots along the top of the files. It is located next to the trash can icon. Selecting the more icon gives you the option to move the file into a folder.
Choose the folder you want to move the file into.
Go to the Folder
Find the file you just moved to the folder. Select the file by clicking on it.
Hold down the shift key and strike the Z key. Notice you are now given the option to “Add to” instead of move. You an add the file to a second folder. Repeat with shift Z to add to additional folders.