UUID Link: https://www.uuidgenerator.net/version4
Minecraft's Default Textures: https://github.com/Mojang/bedrock-samples/releases (click on newest one, then assets, and then source code.zip)
Pack Feedback Link: https://discord.gg/7aQQVZuCD8
CubeTheSphere: https://cubethesphere.software.informer.com/1.0/
Best Site to upload packs: https://www.mediafire.com