I have the same problem

You start by download the default bedrock resource pack, then remove any files you don't plan on changing (don't delete the folders going to the files you want to change), then you replace the files you wanted to change with whatrver textures you made, go back to the folder that contains "pack_icon.png" and "manifest.json" hit Ctrl. + A (will select everything in the folder) and conpress it with whatever archiver you have. Keep in mind it needs to be a ".zip" file, rename the extension (.zip) to .mcpack and minecraft windows 10 will take it from there.

You can click the link but if there's no links then you can go in the files and drag it into the texture packs folder, but if it still won't let you get it make sure the mod says it works on bedrock.