Title says it all.
At this time, shaders are only possible on Minecraft Preview and require jumping through hoops to install. These shaders also seem to disable texture packs purchased on the marketplace.
Gamuty clips and future gaming streams can be found on my Rumble Gaming Channel at:
Rumble.com/ShirtlessSpider
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https://www.youtube.com/watch?v=7-EORnJR9FU