How To Add A Behavior Pack To Your Bedrock Server
Getting Started
Just a quick summary of what you'll need to do:
Download your world
Use it in your game locally
Apply any addons you want
Upload the world
Set the value of texturepack-required to true
Need help loading your world? How do I use my own world?
Need help downloading your world? How do I download my world?
Forcing Addons
To force the addons, you will need to use the texturepack-required option. To find this, go to the Files drop down, then select config files.

On the config files page, you will see an option entitled Server Settings, choose it.
Then find the texturepack-required option, change it from false to true.

Updated on: 11/29/2020
Thank you!