You can use Dropbox to host avatars and worlds, and while Dropbox is generally much slower than Google Drive, if your file sizes are below 10 megabytes the speed may be adequate and it does offer the quickest/easiest pipeline to get your content into VRChat.

Simply upload your file to your dropbox, then right click the file and choose 'share Dropbox link'.

Paste this link into the custom field in VRChat and replace the 0 at the end with a 1.

Make sure you save first and reselect your avatar from the drop down list if this is a custom avatar.