We want to use collector for appraiser's to update data at a specific parcel in the field. can we create a layer that is parcel data and when the field worker click on the parcel in the map they can associate data and attachments to that selected parcel.
Updating fields is possible, but currently the ability of the fieldworker to attach files depends on the OS they're using.
From reading Work with attachments—Collector for ArcGIS (Classic) | ArcGIS and testing on my mobile it seems that Windows-based Collector allows to add photos and files as attachments, while in iOS and Android you can only attach photos.
A possible workaround could be letting the fieldworker enter a document name in a dedicated field, and then attach the file or create a URL to its location back at the office.
Vote to create this functionality on ArcGIS Ideas:
Hope this helps,