Android - folder added for sync, only upload new files not existing one

Freenas - i added nextcloud service.
Installed android app added folder for syncing and files already in folder (ex. camera, facebook) nou been uploaded. When i make picture or receive file it is been uploaded to my server.
Any advice.

The app works as designed. If you want to upload existing files you have to select all of them, use share with … Nextcloud, select the Nextcloud destination folder and confirm it.