Embedded subtitle is not showing up

source code: https://code.videolan.org/videolan/VLCKit.git [Branch:3.0][TAG:3.3.10][Commit:1447ac941b1fea318ac357d9706ba34edb0316c4]
Xcode version: xcode 11.4.1
OSX version 10.15.4
build command: sh -x buildMobileVLCKit.sh -f

Using the generated MobileVLCKit.framework, subtitle is not showing up when playing videos with embedded subtitle. Can anyone help?

Edited May 17, 2020 by LeviLin

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information