Bambu Lab A1 in Cura

Cura has no Bambu Lab A1 profile, and preslice cannot make one.

Does Cura ship the Bambu Lab A1?

No. Cura has no Bambu Lab definition at all (Cura's printer definitions). Bambu Studio, OrcaSlicer and Creality Print ship it: 256 × 256 × 256 mm bed, 0.4 mm stainless steel nozzle.

Why not convert to Cura anyway?

Any Cura profile Convert picks is another printer's. Its G-code targets that printer, not your A1, so a converted file does not help.

What should I use instead?

Use a slicer that ships the A1. For a Cura file, see Cura to Bambu Studio. For OrcaSlicer, see Bambu Studio to OrcaSlicer. See what Convert cannot carry.