How do I upload images from my Android to a Gallery album?

Just click on the add images button in the album itself, or in the category above, and then select 'Use an existing album' and select the one that applies.  [If you are creating a new album there is a little more information you have to provide as you are creating a new album but the process is the same once the existing or new album is created.  Then click on the plus symbol '+' symbol and then select from the 'Choose an action' at the bottom of the screen.  To access your gallery images, simply slide the bottom display to the left with your finger, and click on  'Media picker.'  For some Google or other Android users, the choice might be 'Select Media.'  It all depends on the settings of your phone.  For a Samsung Z Flip 5, you see the 'Media picker,' and then browse your source of the images. We tapped on Gallery and selected several images and hit 'Done' and there you go, images uploaded and all that is left is to click on 'Submit all images.'