The very purpose of your NAS is to share files between people and devices. A NAS can surely work as a central storage unit, but to make it live its full purpose, you will have to give it a way to talk ...
If you need to share or transfer files between Linux machines, you have plenty of options. Here are some you might not have considered.
Messaging and social media apps compress your files and sacrifice quality for speed. If you want to share your photos and videos in original quality, Samsung's Quick Share is a great alternative.