Has there been any update to this issue?
1. Created a survey with attachments in WYSIWYG.
2. Exported the feature service created into a file geodatabase.
3. Added the data into SQL Enterprise geodatabase.
4.Published Service into the Portal for ArcGIS(10.6.1) using the SQL table.
5. Created a survey based on the Service.
6. Can submit data into the survey via Survey123 Desktop app or Phone App.
7. Cannot submit attachment data from the web survey version of the survey123.