If you already have a gallery page, you can add new photos to it with a couple of clicks:
1. Log in to your Admin Panel and go to Media library.
2. Go to the album that you want to update. Let’s say that you have the “Fashion” gallery page that uses the feed of the “Fashion” album from your gallery. In this case, you need to open the “Fashion” album.
3. Press the “Upload files to the album” on the right.
You have two options to add a new image. You can drag and drop it on the page or upload it manually. Everything you need to do is to choose the images you want to add.
The uploaded images will show in the album you added them to, and also automatically appear on the gallery page connected with this album.