Copies path into the study's input/ard/ folder (read-only there),
reads it (tflspec::tfl_read_ard(): rds, the JSON / YAML of
tflspec::tfl_write_ard(), XPT, CSV), checks it
(tflspec::tfl_check_ard()) – against the table definition of each
report it is for, when output_id is given – and records it
(ard_imports()). It is then used by a report whose report row says
ard_source = import:<file> (see use_imported_ard()).
Value
The new row of ard_imports(), invisibly, with the check's
problems as the attribute check.