View and contribute to shared albums as an invitee

After the shared album owner has granted you access to contribute, launch Lightroom on iOS.

Select Shared with You to view the list of albums that are shared with you.

Once the group album owner has given you Can Contribute access, you can add photos and videos to the album. Select More   near the album name and then select Add Photos.

If the group album owner has granted you editing access, you can add and edit photos in the album. 

Once the album owner grants access, select the More icon in the Chrome tab.

Select Open in app.

You can now add photos to the album or edit the existing photos.

To access the shared album later, select the Lightroom tab > All photos.

In the Lightroom albums panel, scroll to Your albums, and then select Shared.

Select Shared with you, select the album you want to contribute to, and manage as needed.