If you have checked the option Set the campaign parameters in the fragment portion of the URL (not recommended) immediately under the field that gives you the completed url, then the url builder will append the parameters with a # instead of a ?

By default GA will look for custom utm campaign tracking parameters appended with a ? or #

• that only applies to custom utm campaign tracking parameters though, anything else appended with or following after a # will not be tracked without modifying the GA tracking code snippet.

Not sure why it says not recommended. In days gone by, it was considered "better" practice to use a # for unpaid campaign utm parameters

If you have checked the option Set the campaign parameters in the fragment portion of the URL (not recommended) immediately under the field that gives you the completed URL, then the URL builder will append the parameters with a # instead of a ?.

By default GA will look for custom utm campaign tracking parameters appended with a ? or #.

• that only applies to custom utm campaign tracking parameters though, anything else appended with or following after a # will not be tracked without modifying the GA tracking code snippet.

Not sure why it says not recommended. In days gone by, it was considered "better" practice to use a # for unpaid campaign utm parameters.