I am trying to debug an issue with injecting data via Apex SDK into a merge field to a specific PDF form and it's failing. It is working on other forms we have. Are there some known incompatibilities with certain types of PDF fields? Or is there a log to see why merging is failing?
For example, I noticed that this particular form has the same name for a few fields - i.e. mergeField - but Adobe Acrobat also shows mergeField#1, mergeField#2, mergefield#3. Is it supported to reference mergeField#1, etc or does each field need a unique name?