My interesting is interactivty. And for this there are format .gltf.
Size of file may be more then 3mb.

All my examples made for mobile telephone

https://www.facebook.com/andrejus.voisnis

Or

3D puzzle
https://cdn.soft8soft.com/AROAJSY2GOEHMOFUVPIOE:a5ee1627e6/applications/_With_Arrows_3D_Puzzle/_With_Arrows_3D_Puzzle.html?fbclid=IwAR2Ym5XHq6l9Iw2MQsmdF3_MU-Jr_BUhNtCjP0d5FxViP26O3uyHwVtiqYI

2D Puzzle
https://cdn.soft8soft.com/AROAJSY2GOEHMOFUVPIOE:415f993d37/applications/Clothes_/Clothes_.html?fbclid=IwAR1zyhZfkpKAkVcqJ4zTiMNbCp5YfH5NNvrW7Ny2ngcwARBjhWVVajUx04U

Simple 3d with texures and shadow

https://cdn.soft8soft.com/AROAJSY2GOEHMOFUVPIOE:49ad5e0fdf/applications/Toy%20Rabbit%20Bunny2/Toy%20Rabbit%20Bunny2.html?fbclid=IwAR1Zpu7vFUYu7mq5FT0tKUCqtukyxXudkxDa5qCuTqMaGNWdY75R7fghrSY