Problem with chat channel url

Problem with chat channel url

 Hello,
 We are trying to use 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 'add attachment (+)' option is not working in the webview , It doesn't do anything when I click on it. 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?