Google Drive (1.17.1+)
Rightclick on your resourcepack zip file and press "Get link"
Important: set the permission to "Anyone with the link"
Press "Copy link"
Paste the link and press on "Get direct link"
The website automatically adds the generated link in your clipboard.
You can now paste the link inside ItemsAdder configuration file
config.yml, then use
You can now see that the pack is correctly loaded by the game.
This is normal. This happens because Google Drive is doing some stuff before authorizing the download of the resourcepack.
This happens only when the player downloads the resourcepack for the first time and it will take from 5 to 10 seconds.
This method works 100% of the times on Minecraft 1.17.1 and most recent versions.