I added some entries to the Autofill Templates, consisting of ISO Country Code, Country, State/Province, City, Location, GPS Latitude and GPS Longitude.
When I import new images into IMatch, the corresponding metadata fields are automatically filled from the first entry in the Autofill Templates.
I should add that I'm using version 2023.1.8.
Still experimenting here. I deleted my Autofill templates, exited IMatch, restarted IMatch, imported two test images, and the metadata was still filled from the first entry of my original Autofill Templates.
No AutoFill operations or features are executed when files are imported.
Go to Edit > Preferences > Indexing. Check if you run Metadata Templates during indexing.
Okay, so it was set to run a Metadata Template during indexing. Not something I set intentionally. I note that when I'm scrolling through the preferences screen with the mouse wheel, if the mouse happens to pass over the drop downs, the drop downs change, so I must have done that earlier without noticing.