Problem:
The user was not able to edit a view in the admin area.
Solution:
It turns out that the view was created with the legacy editor, and that the Toolset Settings were changed to only support the blocks editor.
Once we activate the legacy editor too, we were able to edit the view.
Save Toolset Forms Generic field value into database.
Solution:
After user submit the form, you can get the field "avatar-select" value with PHP variable $_POST['avatar-select'], then save it into database, for example: