I have created a sync/web based record type.
However after changing the underlying data in the source, I do not see an option to modify the
model.
Pleas advise.
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What exactly do you mean? CDT? Source expressions? Synced data fields?
Synced data fields
"CONFIGURE FIELDS" doesn't do it?
Also keep in mind that for web service backed records, the fields you can select are entirely dependent on what is returned from your expression. So, you might need to change your expression / integration if you want to use more fields.
Understood. It is my understanding that the SYNC is performed to some database tables which
are not exposed to the application. Correct or am I missing something ?
If for example I would like to join this record with some other record in my database, possible ?
The sync can retrieve data from web services OR databases and it caches the data in Appian. Once the data is synced (cached), it doesn't matter what the original source was - you can join across any source as long as they have a common field to connect them.