Question: Share files/images functionality for the SDK

Hey,

Sorry to open an issue on this project I tried asking this on `#element-android:matrix.org` channel and opened an issue on [matrix-android-sdk2-sample/#4](https://github.com/matrix-org/matrix-android-sdk2-sample/issues/4) but I haven't received any answer so just opening this here.

I just wanted to know that if someone has to add the share files/image functionality in the app using matrix SDK then how to actually do that. I just need some code examples.

[Here](https://github.com/matrix-org/matrix-android-sdk2-sample/issues/4#issuecomment-760545569)(github comment) I was asked to look at the source code of this(element-android) app and I did I saw that there was this `IncomingShareActivity` activity but I wasn't able to figure out exactly what all extras or other attributes are required to add this.