In order to send multiple files you need to create a compressed folder (zip-archive).
Place the files you want to send in a folder, right-click on the folder and choose "Send to compressed folder" or similar.
Now you should have a file named as the folder ending with ".zip". Send this file via Sprend.
Thanks for using Sprend!
You are currently using the free version of Sprend without being registered. This means the recipient will not see who is sending the file unless you tell him or her in the message field.
If you upgrade to a paid Sprend Pro account you will get access to more features that may improve your presence and the recipient experience.