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@userreddit internal wifi of rpi3 is bad quality and very slow, you might consider buy a usb wifi dongle.
@userreddit read the forum and the wiki, please!
https://github.com/recalbox/recalbox-os/wiki/Copy-roms-from-a-Computer-to-the-SD-Card-using-an-USB-Stick-(or-External-Hard-Drive)-(EN)
Wirh your usb plugged in, you can use the file manager from within kodi as well and have an interface.
Another option could be to use a live cd with any linux distribution, like ubuntu.
Oh god, this is sad. I rebooted the pi and my problem was fixed. Learn from me. If you have a problem like this, always reboot before you post.
@userreddit anyway if you want to plug directly your pi to your laptop through an ethernet cable, you need:
@userreddit probably. Connect over WinSCP or using the Network Share directly from Windows Explorer and look directly into the folder.