I am currently working at AI2. Hence the blocks from there.
So list the images from a certain folder (plus subfolders if necessary), dynamically generate as many Image.Pictures as lenghtOfList and display these images (e.g. in horizontal arrangements). Now you can make these images clickable, put them in a list and upload them (list items) to Firebase.
Of course you have to use “Any component” (not like in my example).