Datapack not working after being put into the datapack folder. It displays in-game in the datapack lists, but the containts of it does not appear.

Recently, one of my friends suggested adding some data packs to our server.

I tried to add them, they are from vanilla tweaks [I unzipped the file with the UNZIPME in name] and then I put them in the data packs folder from the world folded. When I try to see the data pack list in-game, they all display, but when I try for an example to actually use my data packs [ex. using elytra x armor, more mob heads ETC.] I cannot find the new features that should be added to the datapacks.