Clicking on a media placeholder should bring up a file upload dialog #84
Description
E.g. currently it's not possible to upload a video on iOS because videos (for some reason?) can't be copied to the clipboard and pasted in the iOS interface.
An open issue is if we should have a way to replace existing images. Like say in image is there already and you want to replace it, without deleting it first. But then we'd need addional UI and potentially overlapping click targets.
So let's try how it feels to users if only empty placeholders bring up a file dialog. And go from there.