Add Caption to Photos

Able to add in Caption to all photo Example now i got 4 folder of photo. each folder consist of 1000 photo. When i select the specific folder able to one time add caption to all. The Caption i am able to set what i want and also have the function to retrieve the photo file name and add to a specific area. Example of Caption: Code: 12345 Jack: is a ass same: $999 i know how to eat Example of photo file name: kid ?? 9?1 01_895373 ¿??º-2_144909 40231-10_83704 24544 adult ??T? L-XXL 3?19 3_724653 Take the file name of 40231-10_8370 this as example, will take the number 8370 replace the Code: 12345 . which will become Code: 8370 Jack: is a ass same: $999 i know how to eat the caption i am able to edit, so different folder the content will change abit. but will need to be able to extract the file name and post at the place i need.