C7837WIP: Android apps-zoom in and zoom out not working

Dear Support
I'm currently using  and-TPnp-vstarcam.apk (android) Version 3.17 for C7837WIP .
It seems that the zoom in and zoom out function doesn't work. Could you check it out. TQ.

1. this option can not in android vscam client.
2. i will feedback this problem to add this option in client.

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