Hi Richard,
If PM is adding the letter A to your files, you are (inadvertently?) ingesting duplicates. There are a couple of potential reasons for this:
1. You are ingesting the same memory card twice without having “incremental ingest” .
2. You do have “incremental ingest” set, but you somehow deleted the small files PM uses to determine where you left off ingesting.
3. You have simply run out of unique file names; if you do not rename the camera files, once it reaches number 9999, the camera will restart at 0000. But even if you rename, you must make sure the file names are truly unique. PM will never overwrite files, but will append a letter (or digit, depending on your preferences) if there is a conflict.
Hope this helps,
Hayo