i tested a brand new user with the following settings and was not able to repro the issue. if i changed them, it would affect how many images or files i could upload as expected. the defaults are 1 and 0.
defaults:
however, i cannot test android since i don’t own an android device. but posting multiple image files seems to work as expected for me on my Macbook and Linux desktops, and iPhone 15 pro mobile viewport.