Send a file to another app
Sending a file requires three confirmations. Otherwise a file will not be sent. This is for your safety.
Use the selection mode to select multiple files / folders and select the share button
from the top menu.
You can also select the share button while viewing a certain file to send this file.
A list will popup with all apps that can handle the selected files. Select the app you'd like to use as the target.
The selected app will ask what you'd like to do with the files. That's the last point where you can cancel the process.
Tip: Don't mix files and folders during a single send-request. This makes sure that your selected target app can properly read the files.