Being an adult jumping in, my friends sent me to Cura and Thingiverse, but my young teen son found Creality's App. I liked it, tried it as well. He made a profile, wants to put creations on there. Two suggestions. They need to stil to STL files for uploads. He got a gcode file that just locked the printer up without printing anything. On two different elements he downloaded.
Maybe our fault, but the Creality Ender 3 V2 pair that we purchased for father/son model making light sabers and fun show off stuff works great on stl files sliced on Cura, just not from .gcode straight from Creality's app or anyone. .gcode is horrible anyways, can't resize (that we can figure out) or modify).
It does need a bigger community of hobbiests with better lists, more pickers of the prints when complete, etc.
It's a good start, though. Draws the kids in, but when the printer locks up... sorry, have to move my kids over to another site when he can't get stl files every time. 4 stars for actually making a quality app and quality site with real editting tools on them though. That's awesome! Just please, stl. Have I mentioned mandatory stl files?