To make a texture pack for "Xbox One" you need to have a (USB flash drive *Purchase* ) for your computer. First you need to take an image editing software I recommend (Adobe Photoshop *Purchase* ) then you copy and paste the block files. then you want to edit them. After you edit the Bedrock files Then Turn them into a .mcpack folder. after you put them in an external folder. Once you do that plug in the USB flash drive into the computers USB slot. Move the External folder to the USB flash drive. Unplug the flash drive and plug it in into the Xbox usb drive. Open the Files App, then Open the folder. After that Click the .mcpack and It should launch minecraft and import the texture pack to the Resource Packs Section