Reimporting thingworx extension is not showing reflected changes

Hello Team,

1.Firstly, created an extension from java imported on thingworx.

2.Then deleted the extension and reimported the extension with some changes(after building and packaging extension in java).

3.But now the changes are not getting reflected it is showing the same old imported extension data and status. 

What needs to  be done on this?

Any help is appreciated