There is also a video with the instructions : https://youtu.be/NYsGxuiMtC8

To share a Folder or a file with someone using filr you need to log in at https://share.smseng.com
Find the folder or file that you want to share and click share.

Then type the email of the person that you want to share it with and set the expiration date.

After that , click save. This will send an invitation to their email address and they will have access to the files.