Tried to install timestyle-bb-pebble.0.8.1_20171015.pbw using GadgetBridge on my Pebble Steel(firmware 3.12), and got:
pbw/pbz is broken or incompatible with your Hardware or Firmware
Compare to original TimeStyle pbw file from Pebble appstore, and find the following files are missing in the pbw archive:
aplite/app_resources.pbpack
aplite/manifest.json
aplite/pebble-app.bin
Please support the aplite platform.