① You need a plugin ItemsAdder and put it into your server
② Confirm that the pre-plugins LoneLibs and ProtocolLib have been installed
③ Run the server, so that the ItemsAdder file is generated, and the ItemsAdder installation action is completed
④ Unzip the downloaded compressed file, and overwrite the data folder inside to the data folder generated by the ItemsAdder file
⑤ Use the command /iazip to pack the material
⑥ Go to this path to get the resource pack ["plugins\ItemsAdder\data\resource_pack\pack.zip"]
⑦ Install the acquired resource pack pack.zip
⑧ Use command /ia to open ItemsAdder item list
⑨ Get the items! Have Fun!