[TYPO3] [Extension] File management in pi

[Sylvain Gourvil]

Hi everybody

I have created an exension with a file selection in backend.

it is working in backend with filemount I defined ...

But if the user choose file 'xxx.jpg' for example, the pi extension will 
get xxx_01.jpg back from database ?

How could I know which file it is ?
I red core api documentation and did not find it !

How typo3 manage this ?

Thx