Attribute Rule, Cannot retrieve attachments

[danbecker]

Why can't I retrieve any attachments when using an attribute rule, Insert trigger on a layer that has attachments enabled? 

This is an Enterprise Geodatabase that's published to Enterprise 11.4 as a referenced feature service.

Both methods below fail to retrieve the attachment on the photo_point layer.

Count(Attachments($feature))
//always reports 0

var sql = Concatenate(["(rel_globalid = '",$feature.globalid,"')"]);
var photoTableFeatSet = Filter(FeatureSetByName($datastore,'dbname.dbo.photo_point__ATTACH',['rel_globalid','att_name'],false),sql);
Count(photoTableFeatSet)
//always reports 0

I even setup a feature service webhook on photo_point layer, listening for 'AttachmentsCreated', which successfully fires a powerAutomate flow. 

But, inside the flow, calling /extractChanges, with the below query params

{
  "token": "validToken",
  "dataFormat": "json",
  "layers": "[5]",
  "returnAttachments": "true",
  "returnAttachmentsDataByUrl": "true",
  "f": "json",
  "serverGens": "1742307850054,1742307850055"
}

then the returned change "attachments" value always is this:

"attachments": {
                    "adds": [],
                    "updates": [],
                    "deleteIds": []
                }

what is happening? 

All I want to do is retrieve attachments on a feature that is inserted into a layer. Either by attribute rule or feature service webhook, I don't care! 

[danbecker]

The AttachmentsCreated feature service webhook fires reliably, but I discovered Editor Tracking on the SDE geodatabase attachment table has to be enabled in order for the attachments:{adds:[]} JSON object returned from /extractChanges to be populated with the attachment info. 

But ONLY in an online workflow. If the field maps app is used offline, then the feature (with attachment) is synced, the webhook fires, but attachments:{adds:[]} is empty. 

Anyone else experience this? We're using ArcGIS Enterprise 11.4