The UploadQuestion type, unlike most others, does not currently resolve field references in attributes. With Survey123, we are adding generic esri::bind:parameters and esri::body:parameters to cover features out of scope for XLSForm; the body parameter needs xpath value insertion.
Given the time that's elapsed, I needed to reset the fix and have submitted #386. It's failing the CI test with regard to proper formatting, but the error is not helpful to resolve.
The UploadQuestion type, unlike most others, does not currently resolve field references in attributes. With Survey123, we are adding generic
esri::bind:parameters
andesri::body:parameters
to cover features out of scope for XLSForm; thebody
parameter needs xpath value insertion.