To accept a Shared Library Invitation, visit the Web Portal in UNIFI by clicking on the globe icon on the left side of the screen in the UNIFI app.

Next, select Libraries from the left side of the screen.

You'll see that pending invite at the top of the page.

Click on the library to select and then hit Accept on the right side of the screen.

A screen will now appear that allows you to accept the invitation. You can even send a custom message back to the account that sent you the library invitation. Next, read and agree to the terms of service and select Accept Invitation.

Then select Finished in the bottom right corner of that window.

You'll now be able to view the library by going back to the UNIFI app and clicking on the folder icon on the left side of the screen.

That library is now listed among your libraries. You'll see a people icon and the name of the account that shared the library with you.

Now all you need to do is click on that library and you have access to all of that shared content.