Ok, your question is a bit confusing therefore also what people replied to you sounds a bit strange.
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If you want to regulary transfer files to/from OSMC and you are just looking for a more performant network solution than samba then check out nfs, ftp, rsync or scp.
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If you want to do it one time and you have the files on a USB Drive/Stick and you just don’t know how to transfer them from the USB drive to the SD Card here are some ideas:
a.) Get some linux knowledge. Here is a cheatsheet for how to navigate in a Linux shell: Cheatsheets and Tutorials for users new to Linux based operating systems
b.) There is a filemanager gui within OSMC/Kodi under “system”
c.) Login OSMC via ssh you then either just can use the copy command cp -r \media\name-of-your-usb\folder-with-files \home\osmc\Movies . Alternatively if you like to have a tool to support you install mc sudo apt-get install mc