API csv Import GUI with Formprocessor fails with smarty errors
CSV Import and Form Processor IS a powerful combo!  Check out the advimportformprocessor extension.
Note that this combines the &quot;advimport&quot; extension rather than the CSV API GUI extension with Form Processor.  It's overall better, but some work on advimport's rough edges would improve the UX.
Also note that Form Processor is pretty slow, so imports using this technique should account for that.