Not yet. A OneSpace transfer carries one file, so you cannot pick several files, or a folder, for a single link.
The way around it is to zip first. Put the files into a zip on your computer and send the zip as one file. Your recipient unzips it at their end, and the transfer stays end-to-end encrypted the whole way.
You can keep as many files as you like in your OneSpace file list. It is the sending step that takes one at a time, which is why the app can look like it should allow more.
Sending several files in one transfer is a feature request we have logged, and it is on our roadmap. We are not putting a date on it here.
A related question we get: can someone have standing access to a folder, so they can drop files in whenever they want? No. OneSpace sends a file to a person. It is not shared storage. If that is the shape of what you need, tell us, because it helps us decide what to build next.
Still stuck? Email support@onespacesecurity.com from the email address on your account. A real person reads it.