Hi Ron,
Survey123 and Collector for ArcGIS are really targeting different use cases. You may find some scenarios where Collector is the right approach, but for others Survey123 may be a better fit. It just happens that you had no choice until not long ago.
In regards with extracting the attachments from ArcGIS Online, here are a few approaches:
1- In the http://survey123.esri.com web site, first login, hover your mouse over the survey of your interest and click on View Results. Then simply download your feature service as a file geodatabase. You can open the file geodatabase in ArcMap or ArcGIS Pro, identify features and get access to your attachments. From the http://survey123.esri.com web site you can also download your feature service as a csv, although that option will not download your attachments.
2- In http://arcgis.com, first login and then go into your contents. You should see a bunch of folders prefixed with survey- Look for the survey of your interest and open that folder. Then go into the feature service and export its contents to a file geodatabase.
Regardless of how you get the file geodatabase (through survey123.esri.com or arcgis.com), you may want to actually extract the attachments from the file geodatabase. Have a look at this article which describes how to use a python script to save your images as files on disk. Combining #1 or #2 above plus the python script I think you will be able to get what you wanted.
ismael
