I have a UIWebView inside my ios application , which loads responsive website into my webview, developed in asp.net . Website has a button to choose video from device Photo
The problem is related to a bug in UIWebView which makes all file input to have the multiple attribute set automatically.
The only solution for iOS 10.3 is to use WKWebView instead, which does not add the multiple attribute automatically.
It's mostly old iOS apps that use UIWebView which I guess is the reason why there are not many bug reports on the web related to this problem.