Seek a digitizer that performs an actual machine test sew out on compatible fabric, troble shoots their own design, ensures their work met your Spec's prior to sending it to you.
A skilled digitizer knows what questions must be asked/answered, included in Order Spec's.
If Customer Order Spec's are met, then no edit(s) are required.
CHANGES to Order Spec's is diffierent Animal and should be billable and advised/agreed too in writing prior to change(s).
EDITS should NOT be required if a digitizer is any good, knows how to follow directions - Order Spec's, asks questions if not sure, test sews - trouble shoots their own work on like fabric, ensures their design met Specs, is pathed correctly, is optimal production run - FIRST TIME.
Now That's Worth Paying For!