Not able to use the upload feature through web_viewer

Hello,
I am able to make the app and install it fine. But when using it I am limited in the things I can do. For instance, I am not able to upload pictures through the web_viewer. Is there anything more I can add to the app to make this function right?

Hello,
I’m facing the same issue, it doesn’t work on Android as well as on IPhone.
Nicolas