always try to think differently, instead of asking a direct solution.
according to your requirement what you can do is -
set the upload page url in a global variable and whenever that url is opened in a web viewer open that link using external browser or chrome custom tabs.
oke genious
lets assume I did what you said. Now an uploading link is opened in the external browser or chrome custom tabs now the user has to login again there. let’s assume my apps users are so stupid that they won’t mind logging twice without thinking of anything suspicious activity and they have uploaded what they want to.
what after that?? how I will I detect that? how I will bring them again to my app?
tell me genius
first of all keep all your attitude in your pocket…
if you think this method wont work on your app then dont use it,
let me remind you again… this is kodular so you have to work according to the kodular system, dont compare it with others. if kodular is not good enough for you then you are free to go to android studio or any other app inventor platform where web viewer supports uploading.