Channel URL is not supporting attachment through chat

Channel URL is not supporting attachment through chat

 Hello,

We are using your chat feature to provide support to our customers.We are opening the chat channel url in a webview in our android application which is built using Appcelerator Titanium.However the 'Attachment' option is not working in the webview. But it works for any mobile and web browsers if i directly open the channel url.

Is it a known issue for webview? Any suggestions to fix this?