Anybody know of a way to generate a link to a custom record's online form so that they can come back and edit the form with the underlying data defaulted in?

Take a look at: •

url.resolveRecord

Yeah, that was the first thing I looked at too, but I don't see any parameters that indicate you can use it to get an external online form URL - essentially need this publishable form URL, but with an existing record's internal ID passed in so it's field values are defaulted.

You can pass parameters in the URL. I've done something similar with an online customer form something like this in an email template: #if entity.billzip?has_content#assign url_parameters += '&zipcode=${entity.billzip}'//#if a href="${form_url}${url_parameters}" target="_blank" rel="noopener" I found the formatting a bit odd when the parameters being passed are the field IDs, so I wrote a client script attached to the form which parses parameters which have a prefix into the appropriate field (parameter example_zipcode fills in to field with ID zipcode, etc). Not sure if you can pass the internal ID of a record and have it fill in data from the record, that strikes me as a security risk to have a publicly-accessible form able to do that, but you can absolutely pass individual fields

Thanks! That did the trick! Made a field for the "Previous Application", tacked that onto the external URL, and sourced all the other fields from that field. Search/duplicate functionality of online forms then allowed for update of an existing form.