Hass.io dropbox_uploader.sh files not found

Hi All

Iam using this Add-on (https://github.com/danielwelch/hassio-dropbox-sync) dropbox uploder.

I wan to do some little modification in the script to uplod my jpg files in diferrent directory, I know what I have to to modify but I could not find the ADD-ON files (dropbox_uploader.sh) in the rasbery pi filesystem, why ? where are these filse ?

find /share -regextype posix-extended -regex “^.*.(${FILETYPES})” -exec ./dropbox_uploader.sh -s -f /etc/uploader.conf upload {} “$OUTPUT_DIR” ;

Even I would like to use (https://github.com/andreafabrizi/Dropbox-Uploader) this by command line the same issue the file not exist, but from the hassio script, nodered ist working.

Where it is hide these files ?
Thx your answer.