I still think this feature request is a bit convoluted to gain traction, hence it being dormant for 6 years perhaps.
Really, the simplest of changes would suffice short term, as illustrated by @alanyoshioka above and as requested here :
https://forum.inaturalist.org/t/add-option-to-link-observations-on-upload/70048
But the simpler request has been closed, so your votes are lost
@gerrit_oehm @matthewvosper @lynkos @tser @grampianshiker
… vote here instead!