synccer

Hello, I was wondering if it is possible to use the folders that have been synced to my VPS, and are currently owned by the user rslsync (and in the group rslsync, and in the user rslsync's /home/rslsync/Resilio/ directory) , as a source for a self hosted photo app (https://github.com/thibaud-rohmer/PhotoShow/)? If so, I think I need to leave the user and group the same, but can I add the rslsync user to the www-data group to make the synced folders readable by the Apache webserver? Thank you.