Mobile Dashboards Don't Allow Editing or Adding Photos to Files

I have a delivery schedule dashboard that shows all orders that are on the delivery schedule for that day. I got my delivery drivers an iPad to be able to let them upload the delivery photos easily to the files column. The problem is that it won’t let me upload or view anything through the dashboard on iPad or even on my phone. In the regular boards it will let me upload pictures, but through the dashboard it doesn’t let me view order form files (PDFs) or add photos there. Is there something I’m missing? It allows me to do it through the dashboard on my computer but not through the app on iPad and iPhone. Please Help!