Add trace logging in uploadPhoto

Trying to debug #15

lr-inaturalist-publish.lrdevplugin/Upload.lua

@@ -8,6 +8,7 @@ local LrTasks = import("LrTasks")
 local INaturalistAPI = require("INaturalistAPI")
 local MetadataConst = require("MetadataConst")
 local SyncObservations = require("SyncObservations")
+local json = require("dkjson")
 
 local Upload = {}
 
@@ -49,8 +50,10 @@ end
 
 local function uploadPhoto(api, observations, rendition, path, exportSettings)
 	local observationUUID = rendition.photo:getPropertyForPlugin(_PLUGIN, MetadataConst.ObservationUUID)
+	logger:tracef("uploadPhoto. observationUUID = %s", observationUUID)
 
 	if observationUUID and observations[observationUUID] then
+		logger:tracef("Updating observation with UUID %s", observationUUID)
 		-- There's already an observation that was created this session. It's
 		-- faster to add an observation photo than upload photo then update the
 		-- observation.
@@ -70,11 +73,14 @@ local function uploadPhoto(api, observations, rendition, path, exportSettings)
 	-- the latter case it will be added to the list of observation_photos.
 	local photo = api:createPhoto(path)
 	LrFileUtils.delete(path)
+	logger:tracef("Created photo, got observation: %s", json.encode(photo.to_observation))
 	local observation = updateObservation(photo.to_observation, rendition.photo, exportSettings)
+	logger:tracef("Updated observation with photo metadata: %s", json.encode(observation))
 	-- Weirdly the `to_observation` included in the photo response doesn't
 	-- include the photo ID
 	observation.local_photos = { [0] = { photo.id } }
 	observation = api:createObservation(observation)
+	logger:tracef("createObservation response: %s", json.encode(observation))
 
 	return photo, observation
 end