Often people want to work on the same Construct project as a team. Construct supports saving projects in a folder structure, where each part of the project is s...
I've tested a few times, certainly saving the project - if I move an object and save, it appears. If I modify a tilemap and save then nothing appears in the commit list.
What's interesting is if I edit the tile map and then do something like move an objects position, when I commit the changes the tile map edits are saved. So that data is being captured, its just if I edit the tilemap and do nothing else, git thinks I've made no edits to the project and nothing appears in the commit list.
Tilemap data is saved in the corresponding layout JSON file, so check for changes there. Maybe GitHub Desktop isn't checking there or something, or perhaps you forgot to add the files in the first place.