You can upload multiple files or folders simultaneously by using a zip file. Check out this article in our Knowledge Base for instructions.
Special note for Mac users: If you're using macOS X's native compression utility, an additional folder called
__MACOSX containing file metadata will be unpacked. You should either delete this folder from your Site after unpacking, or run the following command on the zip file prior to unpacking:
zip -d filename.zip __MACOSX/\*